{"id":1922,"date":"2021-07-23T10:56:28","date_gmt":"2021-07-23T05:26:28","guid":{"rendered":"http:\/\/ncertsolutions.guru\/?p=1922"},"modified":"2021-07-23T12:21:49","modified_gmt":"2021-07-23T06:51:49","slug":"ncert-solutions-for-class-9-science-chapter-12-hindi","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-12-hindi\/","title":{"rendered":"NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium)"},"content":{"rendered":"<h2><span style=\"color: #00ccff;\">NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium)<\/span><\/h2>\n<p>These Solutions are part of <a href=\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-hindi-medium\/\">NCERT Solutions for Class 9 Science in Hindi Medium<\/a>. Here we have given NCERT Solutions for Class 9 Science Chapter 12 Sound.<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>\u092a\u093e\u0920\u0917\u0924 \u0939\u0932 \u092a\u094d\u0930\u0936\u094d\u0928 (NCERT IN-TEXT QUESTIONS SOLVED)<\/strong><\/span><\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 182)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0915\u093f\u0938\u0940 \u092e\u093e\u0927\u094d\u092f\u092e \u092e\u0947\u0902 \u0927\u094d\u0935\u0928\u093f \u0926\u094d\u0935\u093e\u0930\u093e \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0935\u093f\u0915\u094d\u0937\u094b\u092d \u0906\u092a\u0915\u0947 \u0915\u093e\u0928\u094b\u0902 \u0924\u0915 \u0915\u0948\u0938\u0947 \u092a\u0939\u0941\u0901\u091a\u0924\u093e \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u091c\u092c \u0915\u094b\u0908 \u0935\u0938\u094d\u0924\u0941 \u0915\u0902\u092a\u0928 \u0915\u0930\u0924\u0940 \u0939\u0948 \u0924\u094b \u0905\u092a\u0928\u0947 \u091a\u093e\u0930\u094b\u0902 \u0913\u0930<br \/>\n\u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0947 \u0915\u0923\u094b\u0902 \u0915\u094b \u092d\u0940 \u0915\u0902\u092a\u092e\u093e\u0928 \u0915\u0930 \u0926\u0947\u0924\u0940 \u0939\u0948\u0964 \u092f\u0947 \u0915\u0923 \u0915\u0902\u092a\u092e\u093e\u0928 \u0935\u0938\u094d\u0924\u0941 \u0938\u0947 \u0938\u094d\u0935\u092f\u0902 \u091a\u0932\u0915\u0930 \u0939\u092e\u093e\u0930\u0947 \u0915\u093e\u0928\u094b\u0902 \u0924\u0915 \u0928\u0939\u0940\u0902 \u092a\u0939\u0941\u0901\u091a\u0924\u0947 \u0939\u0948\u0902 \u092c\u0932\u094d\u0915\u093f \u0915\u0902\u092a\u092e\u093e\u0928 \u0935\u0938\u094d\u0924\u0941 \u0915\u0947 \u0938\u092c\u0938\u0947 \u0928\u091c\u0926\u0940\u0915 \u0935\u093e\u0932\u0947 \u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0947 \u0915\u0923 \u0905\u092a\u0928\u0940 \u0938\u0902\u0924\u0941\u0932\u093f\u0924 \u0905\u0935\u0938\u094d\u0925\u093e \u0938\u0947 \u0935\u093f\u0938\u094d\u0925\u093e\u092a\u093f\u0924 \u0939\u094b \u091c\u093e\u0924\u0947 \u0939\u0948\u0902 \u091c\u094b \u0905\u092a\u0928\u0947 \u0928\u093f\u0915\u091f\u0935\u0930\u094d\u0924\u0940 \u0915\u0923 \u092a\u0930 \u092c\u0932 \u0932\u0917\u093e\u0915\u0930 \u0909\u0938\u0947 \u092d\u0940 \u0935\u093f\u0938\u094d\u0925\u093e\u092a\u093f\u0924 \u0915\u0930 \u0926\u0947\u0924\u0947 \u0939\u0948\u0902 \u0924\u0925\u093e \u092a\u094d\u0930\u093e\u0930\u0902\u092d\u093f\u0915 \u0915\u0923 \u0935\u093e\u092a\u0938 \u0905\u092a\u0928\u0940 \u092e\u0942\u0932 \u0905\u0935\u0938\u094d\u0925\u093e \u092e\u0947\u0902 \u0932\u094c\u091f \u0906\u0924\u0947 \u0939\u0948\u0902\u0964 \u092e\u093e\u0927\u094d\u092f\u092e \u092e\u0947\u0902 \u092f\u0939 \u092a\u094d\u0930\u0915\u094d\u0930\u093f\u092f\u093e \u0924\u092c \u0924\u0915 \u091a\u0932\u0924\u0940 \u0930\u0939\u0924\u0940 \u0939\u0948 \u091c\u092c \u0924\u0915 \u0915\u093f \u0927\u094d\u0935\u0928\u093f \u0939\u092e\u093e\u0930\u0947 \u0915\u093e\u0928\u094b\u0902 \u0924\u0915 \u0928\u0939\u0940\u0902 \u092a\u0939\u0941\u0901\u091a \u091c\u093e\u0924\u0940 \u0939\u0948\u0964 \u0907\u0938 \u0924\u0930\u0939 \u092e\u093e\u0927\u094d\u092f\u092e \u092e\u0947\u0902 \u0927\u094d\u0935\u0928\u093f \u0926\u094d\u0935\u093e\u0930\u093e \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0935\u093f\u0915\u094d\u0937\u094b\u092d (\u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0947 \u0915\u0923 \u0928\u0939\u0940\u0902) \u092e\u093e\u0927\u094d\u092f\u092e \u0938\u0947 \u0939\u094b\u0924\u093e \u0939\u0941\u0906 \u0938\u0902\u091a\u0930\u093f\u0924 \u0939\u094b\u0924\u093e \u0939\u0948\u0964<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 182)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0906\u092a\u0915\u0947 \u0935\u093f\u0926\u094d\u092f\u093e\u0932\u092f \u0915\u0940 \u0918\u0902\u091f\u0940, \u0927\u094d\u0935\u0928\u093f \u0915\u0948\u0938\u0947 \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0915\u0930\u0924\u0940 \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0939\u092e\u093e\u0930\u0947 \u0935\u093f\u0926\u094d\u092f\u093e\u0932\u092f \u0915\u0940 \u0918\u0902\u091f\u0940 \u092e\u093f\u0936\u094d\u0930\u0927\u093e\u0924\u0941 \u0938\u0947 \u092c\u0928\u0940 \u0939\u094b\u0924\u0940 \u0939\u0948\u0964 \u091c\u093f\u0938\u0947 \u0939\u0925\u094c\u0921\u093c\u0947 \u0915\u0940 \u091a\u094b\u091f \u0938\u0947 \u0915\u0902\u092a\u092e\u093e\u0928 \u0915\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u0915\u0902\u092a\u0928 \u0915\u0947 \u0915\u093e\u0930\u0923 \u0939\u0935\u093e \u092e\u0947\u0902 \u0935\u093f\u0915\u094d\u0937\u094b\u092d \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0939\u094b\u0924\u093e \u0939\u0948\u0964 \u0924\u0930\u0902\u0917 \u090f\u0915 \u0935\u093f\u0915\u094d\u0937\u094b\u092d \u0939\u0948 \u091c\u094b \u0939\u0935\u093e \u092e\u0947\u0902 \u0906\u0917\u0947-\u092a\u0940\u091b\u0947 \u0915\u0902\u092a\u0928 \u0915\u0930\u0924\u0940 \u0939\u0941\u0908 \u0939\u092e\u093e\u0930\u0947 \u0915\u093e\u0928\u094b\u0902 \u0924\u0915 \u092a\u0939\u0941\u0901\u091a \u091c\u093e\u0924\u0940 \u0939\u0948\u0964 \u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0947 \u0915\u0923 \u0915\u0947\u0935\u0932 \u0926\u094b\u0932\u0928 \u0915\u0930\u0924\u0947 \u0939\u0948\u0902 \u0914\u0930 \u0935\u093f\u0915\u094d\u0937\u094b\u092d \u0906\u0917\u0947 \u092c\u0922\u093c \u091c\u093e\u0924\u093e \u0939\u0948\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0915\u094b \u092f\u093e\u0902\u0924\u094d\u0930\u093f\u0915 \u0924\u0930\u0902\u0917\u0947\u0902 \u0915\u094d\u092f\u094b\u0902 \u0915\u0939\u0924\u0947 \u0939\u0948\u0902?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0915\u0947 \u0917\u092e\u0928 \u0915\u0947 \u0932\u093f\u090f \u0915\u093f\u0938\u0940 \u092e\u093e\u0927\u094d\u092f\u092e; \u091c\u0948\u0938\u0947-\u0935\u093e\u092f\u0941, \u091c\u0932 \u0938\u094d\u091f\u0940\u0932 \u0906\u0926\u093f \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u094b\u0924\u0940 \u0939\u0948\u0964 \u092f\u0939 \u0928\u093f\u0930\u094d\u0935\u093e\u0924 \u0938\u0947 \u0939\u094b\u0915\u0930 \u0928\u0939\u0940\u0902 \u091a\u0932 \u0938\u0915\u0924\u0940\u0964 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u0947\u0902 \u0924\u092d\u0940 \u0938\u0902\u091a\u0930\u093f\u0924 \u0939\u094b \u0938\u0915\u0924\u0940 \u0939\u0948\u0902 \u091c\u092c \u0909\u0938\u0915\u0947 \u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0947 \u0915\u0923 \u0906\u0917\u0947-\u092a\u0940\u091b\u0947 \u0915\u0902\u092a\u0928 \u0915\u0930\u0947\u0902 \u0914\u0930 \u0935\u093f\u0915\u094d\u0937\u094b\u092d \u0906\u0917\u0947 \u092c\u0922\u093c \u091c\u093e\u090f\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 3. \u092e\u093e\u0928 \u0932\u0940\u091c\u093f\u090f \u0915\u093f \u0906\u092a \u0905\u092a\u0928\u0947 \u092e\u093f\u0924\u094d\u0930 \u0915\u0947 \u0938\u093e\u0925 \u091a\u0902\u0926\u094d\u0930\u092e\u093e \u092a\u0930 \u0917\u090f \u0939\u0941\u090f \u0939\u0948\u0902\u0964 \u0915\u094d\u092f\u093e \u0906\u092a \u0905\u092a\u0928\u0947 \u092e\u093f\u0924\u094d\u0930 \u0926\u094d\u0935\u093e\u0930\u093e \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0927\u094d\u0935\u0928\u093f \u0915\u094b \u0938\u0941\u0928 \u092a\u093e\u090f\u0901\u0917\u0947?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0928\u0939\u0940\u0902, \u0915\u094d\u092f\u094b\u0902\u0915\u093f \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917 \u0915\u0947 \u0938\u0902\u091a\u0930\u0923 \u0915\u0947 \u0932\u093f\u090f \u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u094b\u0924\u0940 \u0939\u0948 \u091c\u092c\u0915\u093f \u091a\u0902\u0926\u094d\u0930\u092e\u093e \u092a\u0930 \u0935\u093e\u092f\u0941\u092e\u0902\u0921\u0932 \u0928\u0939\u0940\u0902 \u0939\u094b\u0924\u093e \u0939\u0948\u0964<br \/>\n\u0905\u0924\u0903 \u0928\u093f\u0930\u094d\u0935\u093e\u0924 \u092e\u0947\u0902 \u0927\u094d\u0935\u0928\u093f \u0938\u0902\u091a\u0930\u093f\u0924 \u0928\u0939\u0940\u0902 \u0939\u094b \u0938\u0915\u0924\u0940\u0964<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 186)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0924\u0930\u0902\u0917 \u0915\u093e \u0915\u094c\u0928-\u0938\u093e \u0917\u0941\u0923 \u0928\u093f\u092e\u094d\u0928\u0932\u093f\u0916\u093f\u0924 \u0915\u094b \u0928\u093f\u0930\u094d\u0927\u093e\u0930\u093f\u0924 \u0915\u0930\u0924\u093e<\/strong><br \/>\n<strong>(a) \u092a\u094d\u0930\u092c\u0932\u0924\u093e,<\/strong><br \/>\n<strong>(b) \u0924\u093e\u0930\u0924\u094d\u0935\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n<strong>(a) \u092a\u094d\u0930\u092c\u0932\u0924\u093e (Loudness):<\/strong> \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u092a\u094d\u0930\u092c\u0932\u0924\u093e \u0915\u0902\u092a\u0928 \u0915\u093e \u0906\u092f\u093e\u092e \u0928\u093f\u0930\u094d\u0927\u093e\u0930\u093f\u0924 \u0915\u0930\u0924\u0940 \u0939\u0948\u0964 \u091c\u093f\u0924\u0928\u093e \u0905\u0927\u093f\u0915 \u0906\u092f\u093e\u092e \u0939\u094b\u0917\u093e, \u0927\u094d\u0935\u0928\u093f \u0909\u0924\u0928\u0940 \u0939\u0940 \u092a\u094d\u0930\u092c\u0932 \u0939\u094b\u0917\u0940\u0964<\/p>\n<p><strong>(b) \u0924\u093e\u0930\u0924\u094d\u0935 (Pitch):<\/strong> \u0927\u094d\u0935\u0928\u093f \u0915\u093e \u0924\u093e\u0930\u0924\u094d\u0935 \u0915\u0902\u092a\u0928 \u0915\u0940 \u0906\u0935\u0943\u0924\u094d\u0924\u093f \u0928\u093f\u0930\u094d\u0927\u093e\u0930\u093f\u0924 \u0915\u0930\u0924\u093e \u0939\u0948\u0964 \u091c\u093f\u0924\u0928\u093e \u0905\u0927\u093f\u0915 \u0906\u0935\u0943\u0924\u094d\u0924\u093f \u0939\u094b\u0917\u0940, \u0909\u0924\u0928\u093e \u0905\u0927\u093f\u0915 \u0924\u093e\u0930\u0924\u094d\u0935 \u0939\u094b\u0917\u093e\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u0905\u0928\u0941\u092e\u093e\u0928 \u0932\u0917\u093e\u0907\u090f \u0915\u093f \u0928\u093f\u092e\u094d\u0928 \u092e\u0947\u0902 \u0938\u0947 \u0915\u093f\u0938 \u0927\u094d\u0935\u0928\u093f \u0915\u093e \u0924\u093e\u0930\u0924\u094d\u0935 \u0905\u0927\u093f\u0915 \u0939\u0948?<\/strong><br \/>\n<strong>(a) \u0917\u093f\u091f\u093e\u0930, (b) \u0915\u093e\u0930 \u0915\u093e \u0939\u093e\u0930\u094d\u0928\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> (b) \u0915\u093e\u0930 \u0915\u093e \u0939\u093e\u0930\u094d\u0928\u0964<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 186)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0915\u093f\u0938\u0940 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917 \u0915\u0940 \u0924\u0930\u0902\u0917\u0926\u0948\u0930\u094d\u0918\u094d\u092f, \u0906\u0935\u0943\u0924\u094d\u0924\u093f, \u0906\u0935\u0930\u094d\u0924 \u0915\u093e\u0932 \u0924\u0925\u093e \u0906\u092f\u093e\u092e \u0938\u0947 \u0915\u094d\u092f\u093e \u0905\u092d\u093f\u092a\u094d\u0930\u093e\u092f \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0924\u0930\u0902\u0917\u0926\u0948\u0930\u094d\u0918\u094d\u092f (Wavelength): \u0926\u094b \u0915\u094d\u0930\u092e\u093e\u0917\u0924 \u0938\u0902\u092a\u0940\u0921\u0928\u094b\u0902 (C) \u092f\u093e \u0915\u094d\u0930\u092e\u093e\u0917\u0924 \u0935\u093f\u0930\u0932\u0928\u094b\u0902 (R) \u0915\u0947 \u092c\u0940\u091a \u0915\u0940 \u0926\u0942\u0930\u0940 \u0924\u0930\u0902\u0917\u0926\u0948\u0930\u094d\u0927\u094d\u092f \u0915\u0939\u0932\u093e\u0924\u0940 \u0939\u0948\u0964 \u0924\u0930\u0902\u0917\u0926\u0948\u0930\u094d\u0918\u094d\u092f \u0915\u094b \u03bb (\u0917\u094d\u0930\u0940\u0915 \u0905\u0915\u094d\u0937\u0930 \u0932\u0948\u092e\u094d\u0921\u093e) \u0938\u0947 \u0928\u093f\u0930\u0942\u092a\u093f\u0924 \u0915\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u0907\u0938\u0915\u093e SI \u092e\u093e\u0924\u094d\u0930\u0915 \u092e\u0940\u091f\u0930 (m) \u0939\u0948\u0964<\/p>\n<ul>\n<li><strong>\u0935\u093f\u0915\u0932\u094d\u092a\u0924\u0903<\/strong> \u090f\u0915 \u092a\u0942\u0930\u094d\u0923 \u0926\u094b\u0932\u0928 (Oscillation) \u092e\u0947\u0902 \u0915\u094b\u0908 \u0924\u0930\u0902\u0917 \u091c\u093f\u0924\u0928\u0940 \u0926\u0942\u0930\u0940 \u0924\u092f \u0915\u0930\u0924\u0940 \u0939\u0948, \u0909\u0938\u0947 \u0924\u0930\u0902\u0917\u0926\u0948\u0930\u094d\u0927\u094d\u092f \u0915\u0939\u0924\u0947<\/li>\n<li><strong>\u0906\u0935\u0943\u0924\u094d\u0924\u093f (Frequency):<\/strong> \u090f\u0915\u093e\u0902\u0915 \u0938\u092e\u092f \u092e\u0947\u0902 \u0939\u094b\u0928\u0947 \u0935\u093e\u0932\u0947 \u0926\u094b\u0932\u0928\u094b\u0902 \u0915\u0940 \u0915\u0941\u0932 \u0938\u0902\u0916\u094d\u092f\u093e \u0915\u094b \u0906\u0935\u0943\u0924\u094d\u0924\u093f \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964 \u0907\u0938\u0947 v (\u0917\u094d\u0930\u0940\u0915 \u0905\u0915\u094d\u0937\u0930, \u0928\u094d\u092f\u0942) \u0938\u0947 \u092a\u094d\u0930\u0926\u0930\u094d\u0936\u093f\u0924 (\u0928\u093f\u0930\u0942\u092a\u093f\u0924) \u0915\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u0906\u0935\u0943\u0924\u094d\u0924\u093f \u0915\u093e SI \u092e\u093e\u0924\u094d\u0930\u0915 \u0939\u0930\u094d\u091f\u094d\u091c (hertz) \u0939\u0948\u0964 \u091c\u093f\u0938\u0947 \u092a\u094d\u0930\u0924\u0940\u0915 Hz \u0938\u0947 \u0935\u094d\u092f\u0915\u094d\u0924 \u0915\u0930\u0924\u0947 \u0939\u0948\u0902\u0964<\/li>\n<li><strong>\u0906\u0935\u0930\u094d\u0924 \u0915\u093e\u0932 (Time period):<\/strong> \u0924\u0930\u0902\u0917 \u0926\u094d\u0935\u093e\u0930\u093e \u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0947 \u0918\u0928\u0924\u094d\u0935 \u0915\u0947 \u090f\u0915 \u0938\u0902\u092a\u0942\u0930\u094d\u0923 \u0926\u094b\u0932\u0928 \u092e\u0947\u0902 \u0932\u093f\u090f \u0917\u090f \u0938\u092e\u092f \u0915\u094b \u0906\u0935\u0930\u094d\u0924 \u0915\u093e\u0932 (T) \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964 \u0926\u0942\u0938\u0930\u0947 \u0936\u092c\u094d\u0926\u094b\u0902 \u092e\u0947\u0902 \u0926\u094b \u0915\u094d\u0930\u092e\u093e\u0917\u0924 \u0938\u0902\u092a\u0940\u0921\u0928\u094b\u0902 \u092f\u093e \u0926\u094b \u0915\u094d\u0930\u092e\u093e\u0917\u0924 \u0935\u093f\u0930\u0932\u0928\u094b\u0902 \u0915\u094b \u0915\u093f\u0938\u0940 \u0928\u093f\u0936\u094d\u091a\u093f\u0924 \u092c\u093f\u0902\u0926\u0941 \u0938\u0947 \u0917\u0941\u091c\u0930\u0928\u0947 \u092e\u0947\u0902 \u0932\u0917\u0947 \u0938\u092e\u092f \u0915\u094b \u0924\u0930\u0902\u0917 \u0915\u093e \u0906\u0935\u0930\u094d\u0924 \u0915\u093e\u0932 \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964 \u0907\u0938\u0915\u093e SI \u092e\u093e\u0924\u094d\u0930\u0915 \u0938\u0947\u0915\u0902\u0921 (S) \u0939\u0948\u0964<\/li>\n<li><strong>\u0906\u092f\u093e\u092e (Amplitude):<\/strong> \u0915\u093f\u0938\u0940 \u0924\u0930\u0902\u0917 \u0915\u0947 \u0938\u0902\u091a\u0930\u0923 \u092e\u0947\u0902 \u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0947 \u0915\u0923\u094b\u0902 \u0915\u093e \u092e\u0942\u0932 \u0938\u094d\u0925\u093f\u0924\u093f \u0915\u0947 \u0926\u094b\u0928\u094b\u0902 \u0913\u0930 \u0905\u0927\u093f\u0915\u0924\u092e \u0935\u093f\u0938\u094d\u0925\u093e\u092a\u0928 (\u092f\u093e \u0935\u093f\u0915\u094d\u0937\u094b\u092d) \u0906\u092f\u093e\u092e \u0915\u0939\u0932\u093e\u0924\u093e \u0939\u0948\u0964 \u0907\u0938\u0947 \u0938\u093e\u0927\u093e\u0930\u0923\u0924\u0903 &#8216;A&#8217; \u0926\u094d\u0935\u093e\u0930\u093e \u0928\u093f\u0930\u0942\u092a\u093f\u0924 \u0915\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u0907\u0938\u0915\u093e \u092e\u093e\u0924\u094d\u0930\u0915 \u0926\u093e\u092c \u092f\u093e \u0918\u0928\u0924\u094d\u0935 \u0915\u093e \u092e\u093e\u0924\u094d\u0930\u0915 \u0939\u094b\u0924\u093e \u0939\u0948\u0964 \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u092a\u094d\u0930\u092c\u0932\u0924\u093e \u0905\u0925\u0935\u093e \u092e\u0943\u0926\u0941\u0924\u093e \u092e\u0942\u0932\u0924: \u0907\u0938\u0915\u0947 \u0906\u092f\u093e\u092e \u0938\u0947 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940 \u091c\u093e\u0924\u0940 \u0939\u0948\u0964<\/li>\n<\/ul>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u0915\u093f\u0938\u0940 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917 \u0915\u0940 \u0924\u0930\u0902\u0917\u0926\u0948\u0930\u094d\u0918\u094d\u092f \u0924\u0925\u093e \u0906\u0935\u0943\u0924\u094d\u0924\u093f \u0909\u0938\u0915\u0947 \u0935\u0947\u0917 \u0938\u0947 \u0915\u093f\u0938 \u092a\u094d\u0930\u0915\u093e\u0930 \u0938\u0902\u092c\u0902\u0927\u093f\u0924 \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0924\u0930\u0902\u0917 \u0915\u093e \u0935\u0947\u0917 = \u0906\u0935\u0943\u0924\u094d\u0924\u093f x \u0924\u0930\u0902\u0917\u0926\u0948\u0930\u094d\u0918\u094d\u092f \u03c5 = v x \u03bb.<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 3. \u0915\u093f\u0938\u0940 \u0926\u093f\u090f \u0939\u0941\u090f \u092e\u093e\u0927\u094d\u092f\u092e \u092e\u0947\u0902 \u090f\u0915 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917 \u0915\u0940 \u0906\u0935\u0943\u0924\u094d\u0924\u093f 220 Hz \u0924\u0925\u093e \u0935\u0947\u0917 440 m\/s \u0939\u0948\u0964 \u0907\u0938 \u0924\u0930\u0902\u0917 \u0915\u0940 \u0924\u0930\u0902\u0917\u0926\u0948\u0930\u094d\u0918\u094d\u092f \u092a\u0930\u093f\u0915\u0932\u093f\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i1.wp.com\/farm1.staticflickr.com\/851\/28982917927_1b8b54768f_o.png?resize=409%2C140&#038;ssl=1\" alt=\"Class 9 Science Chapter 12 Intext Questions page 186\" width=\"409\" height=\"140\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 4. \u0915\u093f\u0938\u0940 \u0927\u094d\u0935\u0928\u093f\u0938\u094d\u0930\u094b\u0924 \u0915\u0947 450 m \u0926\u0942\u0930\u0940 \u092a\u0930 \u092c\u0948\u0920\u093e \u0939\u0941\u0906 \u0915\u094b\u0908 \u092e\u0928\u0941\u0937\u094d\u092f 500 Hz \u0915\u0940 \u0927\u094d\u0935\u0928\u093f \u0938\u0941\u0928\u0924\u093e \u0939\u0948\u0964 \u0938\u094d\u0930\u094b\u0924 \u0938\u0947 \u092e\u0928\u0941\u0937\u094d\u092f \u0915\u0947 \u092a\u093e\u0938 \u0924\u0915 \u092a\u0939\u0941\u0901\u091a\u0928\u0947 \u0935\u093e\u0932\u0947 \u0926\u094b \u0915\u094d\u0930\u092e\u093e\u0917\u0924 \u0938\u0902\u092a\u0940\u0921\u0928\u094b\u0902 \u092e\u0947\u0902 \u0915\u093f\u0924\u0928\u093e \u0938\u092e\u092f \u0905\u0902\u0924\u0930\u093e\u0932 \u0939\u094b\u0917\u093e?<\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1773\/30050059218_dff0298961_o.png?resize=382%2C113&#038;ssl=1\" alt=\"Class 9 Science Chapter 12 Intext Questions page 186 answers in pdf hindi\" width=\"382\" height=\"113\" data-recalc-dims=\"1\" \/><br \/>\n<strong>\u0928\u094b\u091f\u0903<\/strong> [\u0915\u094d\u0930\u092e\u093e\u0917\u0924 \u0938\u0902\u092a\u0940\u0921\u0928\u094b\u0902 \u0915\u0947 \u092c\u0940\u091a \u0932\u0917\u093e \u0938\u092e\u092f \u0905\u0930\u094d\u0925\u093e\u0924 \u0906\u0935\u0930\u094d\u0924 \u0915\u093e\u0932 T \u0935\u0938\u094d\u0924\u0941 \u0915\u0940 \u0938\u094d\u0925\u093f\u0924\u093f (\u0926\u0942\u0930\u0940 d = 450 m) \u092a\u0930 \u0928\u093f\u0930\u094d\u092d\u0930 \u0928\u0939\u0940\u0902 \u0915\u0930\u0924\u093e \u0939\u0948\u0964 \u092f\u0939 \u0915\u0947\u0935\u0932 \u092d\u094d\u0930\u092e\u093f\u0924 \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0926\u093f\u092f\u093e \u0917\u092f\u093e \u0939\u0948 \u0924\u093e\u0915\u093f \u091b\u093e\u0924\u094d\u0930\u094b\u0902 \u0915\u0947 \u0915\u094c\u0936\u0932 \u0915\u0940 \u0938\u0939\u0940 \u091c\u093e\u0901\u091a \u0915\u0940 \u091c\u093e \u0938\u0915\u0947\u0964]<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 ( \u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 187)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u092a\u094d\u0930\u092c\u0932\u0924\u093e \u0914\u0930 \u0924\u0940\u0935\u094d\u0930\u0924\u093e \u092e\u0947\u0902 \u0905\u0902\u0924\u0930 \u092c\u0924\u093e\u0907\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1779\/30050059718_1e4c7443fd_o.png?resize=829%2C276&#038;ssl=1\" alt=\"Class 9 Science Chapter 12 Intext Questions page 187\" width=\"829\" height=\"276\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 ( \u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 188 )<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0935\u093e\u092f\u0941, \u091c\u0932 \u092f\u093e \u0932\u094b\u0939\u0947 \u092e\u0947\u0902 \u0938\u0947 \u0915\u093f\u0938 \u092e\u093e\u0927\u094d\u092f\u092e \u092e\u0947\u0902 \u0927\u094d\u0935\u0928\u093f \u0938\u092c\u0938\u0947 \u0924\u0947\u091c \u091a\u0932\u0924\u0940 \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0926\u093f\u090f \u0917\u090f \u092e\u093e\u0927\u094d\u092f\u092e\u094b\u0902 \u092e\u0947\u0902 \u0938\u0947 \u0927\u094d\u0935\u0928\u093f, \u090f\u0915 \u0916\u093e\u0938 \u0924\u093e\u092a\u092e\u093e\u0928 \u092a\u0930 \u0932\u094b\u0939\u0947 \u092e\u0947\u0902 \u0938\u092c\u0938\u0947 \u0924\u0947\u091c \u091a\u0932\u0924\u0940 \u0939\u0948\u0964<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 189)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0915\u094b\u0908 \u092a\u094d\u0930\u0924\u093f\u0927\u094d\u0935\u0928\u093f 3s \u092a\u0936\u094d\u091a\u093e\u0924 \u0938\u0941\u0928\u093e\u0908 \u0926\u0947\u0924\u0940 \u0939\u0948\u0964 \u092f\u0926\u093f \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u091a\u093e\u0932 342 m s-1 \u0939\u094b \u0924\u094b \u0938\u094d\u0930\u094b\u0924 \u0924\u0925\u093e \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u092a\u0943\u0937\u094d\u0920 \u0915\u0947 \u092c\u0940\u091a \u0915\u093f\u0924\u0928\u0940 \u0926\u0942\u0930\u0940 \u0939\u094b\u0917\u0940?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0935\u093e\u092f\u0941 \u092e\u0947\u0902 \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u091a\u093e\u0932 = 342 m\/s<br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i2.wp.com\/farm1.staticflickr.com\/849\/30050059998_8977647cbb_o.png?resize=395%2C228&#038;ssl=1\" alt=\"Class 9 Science Chapter 12 Intext Questions page 188\" width=\"395\" height=\"228\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 190)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0915\u0902\u0938\u0930\u094d\u091f \u0939\u0949\u0932 \u0915\u0940 \u091b\u0924\u0947\u0902 \u0935\u0915\u094d\u0930\u093e\u0915\u093e\u0930 \u0915\u094d\u092f\u094b\u0902 \u0939\u094b\u0924\u0940 \u0939\u0948\u0902?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0915\u0902\u0938\u0930\u094d\u091f \u0939\u0949\u0932 \u0915\u0940 \u091b\u0924\u0947\u0902 \u0935\u0915\u094d\u0930\u093e\u0915\u093e\u0930 \u0907\u0938\u0932\u093f\u090f \u092c\u0928\u093e\u0908 \u091c\u093e\u0924\u0940 \u0939\u0948\u0902\u0964 \u0924\u093e\u0915\u093f \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0928 \u0915\u0947 \u092c\u093e\u0926 \u0927\u094d\u0935\u0928\u093f \u0939\u0949\u0932 \u0915\u0947 \u0938\u092d\u0940 \u092d\u093e\u0917\u094b\u0902 \u092e\u0947\u0902 \u092a\u0939\u0941\u0901\u091a \u091c\u093e\u090f\u0964 \u0935\u0915\u094d\u0930\u093e\u0915\u093e\u0930 \u091b\u0924\u0947\u0902 \u0935\u093e\u0938\u094d\u0924\u0935 \u092e\u0947\u0902 \u090f\u0915 \u092c\u0921\u093c\u0947 \u0905\u0935\u0924\u0932 \u0927\u094d\u0935\u0928\u093f-\u092a\u091f\u094d\u091f (Sound board) \u0915\u0940 \u0924\u0930\u0939 \u0915\u093e\u0930\u094d\u092f \u0915\u0930\u0924\u0940 \u0939\u0948\u0902 \u091c\u094b \u0927\u094d\u0935\u0928\u093f \u0915\u094b \u0928\u0940\u091a\u0947 \u0938\u092d\u0940 \u0938\u094d\u0930\u094b\u0924\u093e\u0913\u0902 (Audience) \u0924\u0915 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u093f\u0924 \u0915\u0930 \u092a\u0939\u0941\u0901\u091a\u093e \u0926\u0947\u0924\u0940 \u0939\u0948\u0902\u0964<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 191)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0938\u093e\u092e\u093e\u0928\u094d\u092f \u092e\u0928\u0941\u0937\u094d\u092f \u0915\u0947 \u0915\u093e\u0928\u094b\u0902 \u0915\u0947 \u0932\u093f\u090f \u0936\u094d\u0930\u0935\u094d\u092f\u0924\u093e \u092a\u0930\u093f\u0938\u0930 \u0915\u094d\u092f\u093e \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0938\u093e\u092e\u093e\u0928\u094d\u092f \u092e\u0928\u0941\u0937\u094d\u092f \u0915\u0947 \u0915\u093e\u0928\u094b\u0902 \u0915\u0947 \u0932\u093f\u090f \u0936\u094d\u0930\u0935\u094d\u092f\u0924\u093e \u092a\u0930\u093f\u0938\u0930<br \/>\n20 Hz \u0938\u0947 20,000 Hz (\u092f\u093e 20 kHz) \u0939\u0948\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u0928\u093f\u092e\u094d\u0928 \u0938\u0947 \u0938\u0902\u092c\u0902\u0927\u093f\u0924 \u0906\u0935\u0943\u0924\u094d\u0924\u093f\u092f\u094b\u0902 \u0915\u093e \u092a\u0930\u093f\u0938\u0930 \u0915\u094d\u092f\u093e \u0939\u0948?<\/strong><br \/>\n<strong>(a) \u0905\u0935\u0936\u094d\u0930\u0935\u094d\u092f \u0927\u094d\u0935\u0928\u093f<\/strong><br \/>\n<strong>(b) \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n(a) 20 Hz \u0938\u0947 \u0915\u092e \u0906\u0935\u0943\u0924\u094d\u0924\u093f \u0915\u0940 \u0927\u094d\u0935\u0928\u093f\u092f\u094b\u0902 \u0915\u094b \u0905\u0935\u0936\u094d\u0930\u0935\u094d\u092f \u0927\u094d\u0935\u0928\u093f \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n(b) 20 kHz \u092f\u093e 20,000 Hz \u0938\u0947 \u0905\u0927\u093f\u0915 \u0906\u0935\u0943\u0924\u094d\u0924\u093f \u0915\u0940\u0964 \u0927\u094d\u0935\u0928\u093f\u092f\u094b\u0902 \u0915\u094b \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u092f\u093e \u092a\u0930\u093e\u0936\u094d\u0930\u0935\u094d\u092f \u0927\u094d\u0935\u0928\u093f \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964<\/p>\n<p><strong>NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 ( \u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 193)<\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u090f\u0915 \u092a\u0928\u0921\u0941\u092c\u094d\u092c\u0940 \u0938\u094b\u0928\u093e\u0930 \u0938\u094d\u092a\u0902\u0926 \u0909\u0924\u094d\u0938\u0930\u094d\u091c\u093f\u0924 \u0915\u0930\u0924\u0940 \u0939\u0948, \u091c\u094b \u092a\u093e\u0928\u0940 \u0915\u0947 \u0905\u0902\u0926\u0930 \u090f\u0915 \u0916\u0921\u093c\u0940 \u091a\u091f\u094d\u091f\u093e\u0928 \u0938\u0947 \u091f\u0915\u0930\u093e\u0915\u0930 1.02s \u0915\u0947 \u092a\u0936\u094d\u091a\u093e\u0924\u094d \u0935\u093e\u092a\u0938 \u0932\u094c\u091f\u0924\u093e \u0939\u0948\u0964 \u092f\u0926\u093f \u0916\u093e\u0930\u0947 \u092a\u093e\u0928\u0940 \u092e\u0947\u0902 \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u091a\u093e\u0932 1531 m\/s \u0939\u094b, \u0924\u094b \u091a\u091f\u094d\u091f\u093e\u0928 \u0915\u0940 \u0926\u0942\u0930\u0940 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1778\/30050060278_6bf0ec1f80_o.png?resize=438%2C207&#038;ssl=1\" alt=\"Class 9 Science Chapter 12 Intext Questions page 193\" width=\"438\" height=\"207\" data-recalc-dims=\"1\" \/><\/p>\n<p style=\"text-align: center;\"><strong><span style=\"color: #0000ff;\">\u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 \u0938\u0947 \u0939\u0932 \u092a\u094d\u0930\u0936\u094d\u0928 (NCERT TEXTBOOK QUESTIONS SOLVED)<\/span><\/strong><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 1. \u0927\u094d\u0935\u0928\u093f \u0915\u094d\u092f\u093e \u0939\u0948 \u0914\u0930 \u092f\u0939 \u0915\u0948\u0938\u0947 \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0939\u094b\u0924\u0940 \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0927\u094d\u0935\u0928\u093f \u090a\u0930\u094d\u091c\u093e \u0915\u093e \u090f\u0915 \u0930\u0942\u092a \u0939\u0948 \u091c\u093f\u0938\u0915\u0947 \u0915\u093e\u0930\u0923 \u0939\u092e \u0938\u0941\u0928 \u092a\u093e\u0924\u0947 \u0939\u0948\u0902\u0964 \u0927\u094d\u0935\u0928\u093f \u0924\u092d\u0940 \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0939\u094b\u0924\u0940 \u0939\u0948 \u091c\u092c \u0915\u094b\u0908 \u0935\u0938\u094d\u0924\u0941 \u0915\u0902\u092a\u0928 (Vibrate) \u0915\u0930\u0924\u0940 \u0939\u0948; \u091c\u0948\u0938\u0947\u0903 \u0938\u093f\u0924\u093e\u0930 \u0915\u0947 \u0924\u093e\u0930 \u0915\u093e \u0915\u0902\u092a\u0928 \u0915\u0930\u0928\u093e\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 2. \u090f\u0915 \u091a\u093f\u0924\u094d\u0930 \u0915\u0940 \u0938\u0939\u093e\u092f\u0924\u093e \u0938\u0947 \u0935\u0930\u094d\u0923\u0928 \u0915\u0940\u091c\u093f\u090f \u0915\u093f \u0927\u094d\u0935\u0928\u093f \u0915\u0947 \u0938\u094d\u0930\u094b\u0924 \u0915\u0947 \u0928\u093f\u0915\u091f \u0935\u093e\u092f\u0941 \u092e\u0947\u0902 \u0938\u0902\u092a\u0940\u0921\u0928 \u0924\u0925\u093e \u0935\u093f\u0930\u0932\u0928 \u0915\u0948\u0938\u0947 \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902?<\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1812\/30050060678_e37bb8c932_o.png?resize=439%2C269&#038;ssl=1\" alt=\"9 Science Chapter 12 Sound \u0905\u092d\u094d\u092f\u093e\u0938 \u0915\u0947 \u092a\u094d\u0930\u0936\u094d\u0928 \u0909\u0924\u094d\u0924\u0930\" width=\"439\" height=\"269\" data-recalc-dims=\"1\" \/><br \/>\n\u092e\u093e\u0928\u093e \u0915\u093f \u0938\u094d\u0935\u0930\u093f\u0924\u094d\u0930 \u0926\u094d\u0935\u093f\u092d\u0941\u091c (Tuning fork) \u0927\u094d\u0935\u0928\u093f \u0915\u093e \u0938\u094d\u0924\u094d\u0930\u094b\u0924 \u0939\u0948\u0964<br \/>\n(i) \u091c\u092c \u092f\u0939 \u0906\u0917\u0947 \u0915\u0940 \u0913\u0930 \u0915\u0902\u092a\u0928 \u0915\u0930\u0924\u0940 \u0939\u0948 \u0924\u094b \u0905\u092a\u0928\u0947 \u0938\u093e\u092e\u0928\u0947 \u0915\u0940 \u0935\u093e\u092f\u0941 \u0915\u094b \u0927\u0915\u094d\u0915\u093e \u0926\u0947\u0915\u0930 \u0938\u0902\u092a\u0940\u0921\u093f\u0924 \u0915\u0930\u0924\u0940 \u0939\u0948 \u0914\u0930 \u0907\u0938 \u092a\u094d\u0930\u0915\u093e\u0930 \u090f\u0915 \u0909\u091a\u094d\u091a \u0926\u093e\u092c \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930 \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0939\u094b\u0924\u093e \u0939\u0948\u0964 \u0907\u0938 \u0915\u094d\u0937\u0947\u0924\u094d\u0930 \u0915\u094b \u0938\u0902\u092a\u0940\u0921\u0928 (C) \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n(ii) \u092f\u0939 \u0938\u0902\u092a\u0940\u0921\u0928 \u0915\u0902\u092a\u092e\u093e\u0928 \u0935\u0938\u094d\u0924\u0941 \u091c\u0948\u0938\u0947 \u091f\u094d\u092f\u0942\u0928\u093f\u0902\u0917 \u092b\u0949\u0930\u094d\u0915 \u0938\u0947 \u0926\u0942\u0930 \u0906\u0917\u0947 \u0915\u0940 \u0913\u0930 \u0917\u0924\u093f \u0915\u0930\u0924\u093e \u0939\u0948\u0964<br \/>\n(iii) \u091c\u092c \u091f\u094d\u092f\u0942\u0928\u093f\u0902\u0917 \u092b\u0949\u0930\u094d\u0915 \u0915\u0940 \u092d\u0941\u091c\u093e \u0935\u093e\u092a\u0938 \u0905\u0902\u0926\u0930 \u0915\u0940 \u0913\u0930 (\u092a\u0940\u091b\u0947 \u0915\u0940 \u0913\u0930) \u0915\u0902\u092a\u0928\u0902 \u0915\u0930\u0924\u093e \u0939\u0948 \u0924\u094b \u090f\u0915 \u0928\u093f\u092e\u094d\u0928 \u0926\u093e\u092c \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930 \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0939\u094b\u0924\u093e \u0939\u0948 \u091c\u093f\u0938\u0947 \u0935\u093f\u0930\u0932\u0928 (R) \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n(iv) \u0907\u0938 \u0924\u0930\u0939 \u091c\u092c \u0935\u0938\u094d\u0924\u0941 \u0915\u0902\u092a\u0928 \u0915\u0930\u0924\u0940 \u0939\u0948 \u0924\u094b \u0935\u093e\u092f\u0941 \u092e\u0947\u0902 \u0938\u0902\u092a\u0940\u0921\u0928 \u0914\u0930 \u0935\u093f\u0930\u0932\u0928 \u0915\u0940 \u090f\u0915 \u0936\u094d\u0930\u0947\u0923\u0940 \u092c\u0928 \u091c\u093e\u0924\u0940 \u0939\u0948\u0964 \u092f\u0939\u0940 \u0938\u0902\u092a\u0940\u0921\u0928 \u0914\u0930 \u0935\u093f\u0930\u0932\u0928 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917 \u092c\u0928\u093e\u0924\u0947 \u0939\u0948\u0902 \u091c\u094b \u092e\u093e\u0927\u094d\u092f\u092e \u0938\u0947 \u0939\u094b\u0915\u0930 \u0938\u0902\u091a\u0930\u093f\u0924 \u0939\u094b\u0924\u0940<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 3. \u0915\u093f\u0938 \u092a\u094d\u0930\u092f\u094b\u0917 \u0938\u0947 \u092f\u0939 \u0926\u0930\u094d\u0936\u093e\u092f\u093e \u091c\u093e \u0938\u0915\u0924\u093e \u0939\u0948 \u0915\u093f \u0927\u094d\u0935\u0928\u093f \u0938\u0902\u091a\u0930\u0923 \u0915\u0947 \u0932\u093f\u090f \u090f\u0915 \u0926\u094d\u0930\u0935\u094d\u092f\u093e\u0924\u094d\u092e\u0915 \u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u094b\u0924\u0940 \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0935\u093f\u0927\u093f :<\/p>\n<ul>\n<li>\u090f\u0915 \u0935\u093f\u0926\u094d\u092f\u0941\u0924 \u0918\u0902\u091f\u0940 \u0914\u0930 \u0915\u093e\u0901\u091a \u0915\u093e \u0935\u093e\u092f\u0941\u0930\u0941\u0926\u094d\u0927 \u092c\u0947\u0932\u091c\u093e\u0930 \u0932\u0940\u091c\u093f\u090f\u0964 \u0935\u093f\u0926\u094d\u092f\u0941\u0924 \u0918\u0902\u091f\u0940 \u0915\u094b \u092c\u0947\u0932\u091c\u093e\u0930 \u092e\u0947\u0902 \u0932\u091f\u0915\u093e\u0907\u090f\u0964<\/li>\n<li>\u092c\u0947\u0932\u091c\u093e\u0930 \u0915\u094b \u090f\u0915 \u0928\u093f\u0930\u094d\u0935\u093e\u0924 \u092a\u0902\u092a \u0938\u0947 \u091c\u094b\u0921\u093c\u093f\u090f\u0964<\/li>\n<li>\u0918\u0902\u091f\u0940 \u0915\u0947 \u0938\u094d\u0935\u093f\u091a \u0915\u094b \u0926\u092c\u093e\u0928\u0947 \u092a\u0930 \u0906\u092a \u0909\u0938\u0915\u0940 \u0927\u094d\u0935\u0928\u093f \u0938\u0941\u0928 \u0938\u0915\u0924\u0947 \u0939\u0948\u0902\u0964<\/li>\n<li>\u0905\u092c \u0928\u093f\u0930\u094d\u0935\u093e\u0924 \u092a\u0902\u092a \u0915\u094b \u091a\u0932\u093e\u0907\u090f \u0914\u0930 \u092a\u094d\u0930\u0947\u0915\u094d\u0937\u0923\u094b\u0902 \u0915\u094b \u0928\u094b\u091f \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1815\/30050060768_da9446e761_o.png?resize=372%2C308&#038;ssl=1\" alt=\"9 Science Chapter 12 Sound Exercises in hindi\" width=\"372\" height=\"308\" data-recalc-dims=\"1\" \/><br \/>\n<strong>\u092a\u094d\u0930\u0947\u0915\u094d\u0937\u0923 :<\/strong><br \/>\n(i) \u091c\u0948\u0938\u0947-\u091c\u0948\u0938\u0947 \u0905\u0927\u093f\u0915\u093e\u0927\u093f\u0915 \u0935\u093e\u092f\u0941 \u092a\u093e\u0924\u094d\u0930 \u0938\u0947 \u0928\u093f\u0915\u093e\u0932\u0940 \u091c\u093e\u0924\u0940 \u0939\u0948; \u0918\u0902\u091f\u0940 \u0915\u0940 \u0927\u094d\u0935\u0928\u093f \u0927\u0940\u092e\u0940 \u0939\u094b\u0924\u0940 \u091c\u093e\u0924\u0940 \u0939\u0948\u0964<br \/>\n(ii) \u091c\u092c \u092c\u0947\u0932\u091c\u093e\u0930 \u0938\u0947 \u0938\u0902\u092a\u0942\u0930\u094d\u0923 \u0935\u093e\u092f\u0941 \u0928\u093f\u0915\u0932 \u091c\u093e\u0924\u0940 \u0939\u0948\u0964 \u0927\u094d\u0935\u0928\u093f \u092c\u093f\u0932\u0915\u0941\u0932 \u0928\u0939\u0940\u0902 \u0938\u0941\u0928\u0940 \u091c\u093e \u0938\u0915\u0924\u0940 \u0939\u0948\u0964 \u0905\u0924\u0903 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0915\u094b \u0932\u0947 \u091c\u093e\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0926\u094d\u0930\u0935\u094d\u092f\u093e\u0924\u094d\u092e\u0915 \u092e\u093e\u0927\u094d\u092f\u092e \u0906\u0935\u0936\u094d\u092f\u0915 \u0939\u0948\u0964<br \/>\n<strong>\u0928\u093f\u0937\u094d\u0915\u0930\u094d\u0937 :<\/strong> \u0927\u094d\u0935\u0928\u093f \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0947 \u092c\u093f\u0928\u093e \u0938\u0902\u091a\u093e\u0930\u093f\u0924 \u0928\u0939\u0940\u0902 \u0939\u094b \u0938\u0915\u0924\u0940\u0964<\/li>\n<\/ul>\n<p><strong>\u092a\u094d\u0930\u0966 4. \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0915\u0940 \u092a\u094d\u0930\u0915\u0943\u0924\u093f \u0905\u0928\u0941\u0926\u0948\u0930\u094d\u0927\u094d\u092f \u0915\u094d\u092f\u094b\u0902 \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u091c\u092c \u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0947 \u0915\u0923\u094b\u0902 \u0915\u093e \u0935\u093f\u0938\u094d\u0925\u093e\u092a\u0928 \u0924\u0930\u0902\u0917 \u0938\u0902\u091a\u0930\u0923 \u0915\u0940 \u0926\u093f\u0936\u093e \u0915\u0947 \u0938\u092e\u093e\u0902\u0924\u0930 \u0939\u094b \u0924\u094b \u0909\u0938\u0947 \u0905\u0928\u0941\u0926\u0948\u0930\u094d\u0927\u094d\u092f \u0924\u0930\u0902\u0917 \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917 \u0938\u0902\u092a\u0940\u0921\u0928 (C) \u0914\u0930 \u0935\u093f\u0930\u0932\u0928 (R) \u0915\u0947 \u0930\u0942\u092a \u092e\u0947\u0902 \u0938\u0902\u091a\u0930\u093f\u0924 \u0939\u094b\u0924\u0940 \u0939\u0948 \u0924\u0925\u093e \u092e\u093e\u0927\u094d\u092f\u092e (\u0935\u093e\u092f\u0941) \u0915\u0947 \u0915\u0923 \u0906\u0917\u0947-\u092a\u0940\u091b\u0947 \u0924\u0930\u0902\u0917 \u0915\u0947 \u0938\u0902\u091a\u0930\u0923 \u0915\u0940 \u0938\u092e\u093e\u0902\u0924\u0930 \u0926\u093f\u0936\u093e \u092e\u0947\u0902 \u0917\u0924\u093f \u0915\u0930\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n\u0905\u0924\u0903 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0915\u094b \u0905\u0928\u0941\u0926\u0948\u0930\u094d\u0918\u094d\u092f \u0924\u0930\u0902\u0917 \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 5. \u0927\u094d\u0935\u0928\u093f \u0915\u093e \u0915\u094c\u0928-\u0938\u093e \u0905\u092d\u093f\u0932\u0915\u094d\u0937\u0923 \u0915\u093f\u0938\u0940 \u0905\u0928\u094d\u092f \u0905\u0902\u0927\u0947\u0930\u0947 \u0915\u092e\u0930\u0947 \u092e\u0947\u0902 \u092c\u0948\u0920\u0947 \u0906\u092a\u0915\u0947 \u092e\u093f\u0924\u094d\u0930 \u0915\u0940 \u0906\u0935\u093e\u091c \u092a\u0939\u091a\u093e\u0928\u0928\u0947 \u092e\u0947\u0902 \u0906\u092a\u0915\u0940 \u0938\u0939\u093e\u092f\u0924\u093e \u0915\u0930\u0924\u093e \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u0917\u0941\u0923\u0924\u093e (Quality or timber)<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 6. \u0924\u0921\u093c\u093f\u0924 \u0915\u0940 \u091a\u092e\u0915 \u0924\u0925\u093e \u0917\u0930\u094d\u091c\u0928 \u0938\u093e\u0925-\u0938\u093e\u0925 \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902\u0964 \u0932\u0947\u0915\u093f\u0928 \u091a\u092e\u0915 \u0926\u093f\u0916\u093e\u0908 \u0926\u0947\u0928\u0947 \u0915\u0947 \u0915\u0941\u091b \u0938\u0947\u0915\u0902\u0921 \u092a\u0936\u094d\u091a\u093e\u0924\u094d \u0917\u0930\u094d\u091c\u0928 \u0938\u0941\u0928\u093e\u0908 \u0926\u0947\u0924\u0940 \u0939\u0948\u0964 \u0910\u0938\u093e \u0915\u094d\u092f\u094b\u0902 \u0939\u094b\u0924\u093e \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0910\u0938\u093e \u092a\u094d\u0930\u0915\u093e\u0936 \u0915\u0940 \u0915\u093e\u092b\u0940 \u0909\u091a\u094d\u091a \u091a\u093e\u0932 \u0915\u0947 \u0915\u093e\u0930\u0923 \u0939\u094b\u0924\u093e \u0939\u0948\u0964<br \/>\n\u092a\u094d\u0930\u0915\u093e\u0936 \u0915\u094b \u091a\u093e\u0932 (C = 3 x 108 m\/s) \u0939\u0948 \u091c\u092c\u0915\u093f \u0927\u094d\u0935\u0928\u093f \u0915\u093e \u091a\u093e\u0932 346 m\/s (25\u00b0C \u092a\u0930) \u0939\u094b\u0924\u093e \u0939\u0948\u0964<br \/>\n\u0938\u094d\u092a\u0937\u094d\u091f\u0924\u0903 \u0927\u094d\u0935\u0928\u093f \u0915\u094b \u0906\u0915\u093e\u0936 \u0938\u0947 \u0927\u0930\u0924\u0940 \u0924\u0915 \u0906\u0928\u0947 \u092e\u0947\u0902 \u0915\u0941\u091b \u0938\u092e\u092f \u0932\u0917 \u091c\u093e\u0924\u093e \u0939\u0948 \u092a\u0930\u0902\u0924\u0941 \u092a\u094d\u0930\u0915\u093e\u0936 \u0932\u0917\u092d\u0917 \u0924\u0941\u0930\u0902\u0924 \u0926\u093f\u0916\u093e\u0908 \u0926\u0947\u0924\u0940 \u0939\u0948\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 7. \u0915\u093f\u0938\u0940 \u0935\u094d\u092f\u0915\u094d\u0924\u093f \u0915\u093e \u0914\u0938\u0924 \u0936\u094d\u0930\u0935\u094d\u092f \u092a\u0930\u093f\u0938\u0930 20 Hz \u0938\u0947 20 kHz \u0939\u0948\u0964 \u0907\u0928 \u0926\u094b \u0906\u0935\u0943\u0924\u094d\u0924\u093f\u092f\u094b\u0902 \u0915\u0947 \u0932\u093f\u090f \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0915\u0940 \u0924\u0930\u0902\u0917\u0926\u0948\u0930\u094d\u0918\u094d\u092f \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i1.wp.com\/farm1.staticflickr.com\/854\/30050060978_83ff8ae3da_o.png?resize=441%2C442&#038;ssl=1\" alt=\"9 Science Chapter 12\" width=\"441\" height=\"442\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 8. \u0926\u094b \u092c\u093e\u0932\u0915 \u0915\u093f\u0938\u0940 \u090f\u0932\u0941\u092e\u093f\u0928\u093f\u092f\u092e \u092a\u093e\u0907\u092a \u0915\u0947 \u0926\u094b \u0938\u093f\u0930\u094b\u0902 \u092a\u0930 \u0939\u0948\u0902\u0964 \u090f\u0915 \u092c\u093e\u0932\u0915 \u092a\u093e\u0907\u092a \u0915\u0947 \u090f\u0915 \u0938\u093f\u0930\u0947 \u092a\u0930 \u092a\u0924\u094d\u0925\u0930 \u0938\u0947 \u0906\u0918\u093e\u0924 \u0915\u0930\u0924\u093e \u0939\u0948\u0964 \u0926\u0942\u0938\u0930\u0947 \u0938\u093f\u0930\u0947 \u092a\u0930 \u0938\u094d\u0925\u093f\u0924 \u092c\u093e\u0932\u0915 \u0924\u0915 \u0935\u093e\u092f\u0941 \u0924\u0925\u093e \u0910\u0932\u0941\u092e\u093f\u0928\u093f\u092f\u092e \u0938\u0947 \u0939\u094b\u0915\u0930 \u091c\u093e\u0928\u0947 \u0935\u093e\u0932\u0940 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0926\u094d\u0935\u093e\u0930\u093e \u0932\u093f\u090f \u0917\u090f \u0938\u092e\u092f \u0915\u094b \u0905\u0928\u0941\u092a\u093e\u0924 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i1.wp.com\/farm1.staticflickr.com\/851\/28982919587_e8bb715ee2_o.png?resize=431%2C165&#038;ssl=1\" alt=\"9 Science Chapter 12 Sound all question answers solved\" width=\"431\" height=\"165\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1834\/28982919947_6b72081fd5_o.png?resize=396%2C379&#038;ssl=1\" alt=\"9 Science Chapter 12 Sound free diwbkiad\" width=\"396\" height=\"379\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 9. \u0915\u093f\u0938\u0940 \u0927\u094d\u0935\u0928\u093f \u0938\u094d\u0930\u094b\u0924 \u0915\u0940 \u0906\u0935\u0943\u0924\u094d\u0924\u093f 100 Hz \u0939\u0948\u0964 \u090f\u0915 \u092e\u093f\u0928\u091f \u092e\u0947\u0902 \u092f\u0939 \u0915\u093f\u0924\u0928\u0940 \u092c\u093e\u0930 \u0915\u0902\u092a\u0928 \u0915\u0930\u0947\u0917\u093e?<\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i1.wp.com\/farm1.staticflickr.com\/858\/28982920377_540a0687d6_o.png?resize=437%2C533&#038;ssl=1\" alt=\"9 Science Chapter 12 Sound pdf free\" width=\"437\" height=\"533\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 10. \u0915\u094d\u092f\u093e \u0927\u094d\u0935\u0928\u093f \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0928 \u0915\u0947 \u0909\u0928\u094d\u0939\u0940\u0902 \u0928\u093f\u092f\u092e\u094b\u0902 \u0915\u093e \u092a\u093e\u0932\u0928 \u0915\u0930\u0924\u0940 \u0939\u0948 \u091c\u093f\u0928\u0915\u093e \u0915\u093f \u092a\u094d\u0930\u0915\u093e\u0936 \u0915\u0940 \u0924\u0930\u0902\u0917\u0947\u0902 \u0915\u0930\u0924\u0940 \u0939\u0948\u0902? \u0907\u0928 \u0928\u093f\u092f\u092e\u094b\u0902 \u0915\u094b \u092c\u0924\u093e\u0907\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0939\u093e\u0901, \u0927\u094d\u0935\u0928\u093f \u092d\u0940 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0928 \u0915\u0947 \u0909\u0928\u094d\u0939\u0940\u0902 \u0928\u093f\u092f\u092e\u094b\u0902 \u0915\u093e \u092a\u093e\u0932\u0928 \u0915\u0930\u0924\u0940 \u0939\u0948 \u091c\u093f\u0928\u0915\u093e \u0915\u093f \u092a\u094d\u0930\u0915\u093e\u0936 \u0915\u0940 \u0924\u0930\u0902\u0917\u0947\u0902 \u0915\u0930\u0924\u0940 \u0939\u0948\u0902\u0964 \u0927\u094d\u0935\u0928\u093f \u0915\u0947 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0928 \u0915\u093e \u0928\u093f\u092f\u092e\u0903<br \/>\n(i) \u0906\u092a\u0924\u093f\u0924 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917, \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u093f\u0924 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917 \u0924\u0925\u093e \u0906\u092a\u0924\u0928 \u092c\u093f\u0902\u0926\u0941 \u092a\u0930 \u0916\u0940\u0902\u091a\u0947 \u0917\u090f \u0905\u092d\u093f\u0932\u0902\u092c\u0964 \u092f\u0947 \u0924\u0940\u0928\u094b\u0902 \u090f\u0915 \u0939\u0940 \u0924\u0932 \u092e\u0947\u0902 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n(ii) \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u092a\u0943\u0937\u094d\u0920 \u0915\u0947 \u0906\u092a\u0924\u0928 \u092c\u093f\u0902\u0926\u0941 \u092a\u0930 \u0916\u0940\u0902\u091a\u0947 \u0917\u090f \u0905\u092d\u093f\u0932\u0902\u092c \u0924\u0925\u093e \u0927\u094d\u0935\u0928\u093f \u0915\u0947 \u0906\u092a\u0924\u0928 \u0939\u094b\u0928\u0947 \u0915\u0940 \u0926\u093f\u0936\u093e \u0924\u0925\u093e \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0928 \u0939\u094b\u0928\u0947 \u0915\u0940 \u0926\u093f\u0936\u093e \u0915\u0947 \u092c\u0940\u091a \u0915\u093e \u0915\u094b\u0923<br \/>\n\u0906\u092a\u0938 \u092e\u0947\u0902 \u092c\u0930\u093e\u092c\u0930 \u0939\u094b\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\ni.e., \u2220i = \u2220r<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 11. \u0927\u094d\u0935\u0928\u093f \u0915\u093e \u090f\u0915 \u0938\u094d\u0930\u094b\u0924 \u0915\u093f\u0938\u0940 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u092a\u0943\u0937\u094d\u0920 \u0915\u0947 \u0938\u093e\u092e\u0928\u0947 \u0930\u0916\u0928\u0947 \u092a\u0930 \u0909\u0938\u0915\u0947 \u0926\u094d\u0935\u093e\u0930\u093e \u092a\u094d\u0930\u0926\u0924\u094d\u0924 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917 \u0915\u0940 \u092a\u094d\u0930\u0924\u093f\u0927\u094d\u0935\u0928\u093f \u0938\u0941\u0928\u093e\u0908 \u0926\u0947\u0924\u0940 \u0939\u0948\u0964 \u092f\u0926\u093f \u0938\u094d\u0930\u094b\u0924 \u0924\u0925\u093e \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u0936\u0940\u0918\u094d\u0930 \u0915\u0940 \u0926\u0942\u0930\u0940 \u0938\u094d\u0925\u093f\u0930 \u0930\u0939\u0947 \u0924\u094b \u0915\u093f\u0938 \u0926\u093f\u0928 \u092a\u094d\u0930\u0924\u093f\u0927\u094d\u0935\u0928\u093f \u0905\u0927\u093f\u0915 \u0936\u0940\u0918\u094d\u0930 \u0938\u0941\u0928\u093e\u0908 \u0926\u0947\u0917\u0940|<\/strong><br \/>\n<strong>(i) \u091c\u093f\u0938 \u0926\u093f\u0928 (\u0924\u093e\u092a) \u0905\u0927\u093f\u0915 \u0939\u094b?<\/strong><br \/>\n<strong>(ii) \u091c\u093f\u0938 \u0926\u093f\u0928 (\u0924\u093e\u092a) \u0915\u092e \u0939\u094b?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0905\u0927\u093f\u0915 \u0924\u093e\u092a\u092e\u093e\u0928 \u0935\u093e\u0932\u0947 \u0926\u093f\u0928 \u092a\u094d\u0930\u0924\u093f\u0927\u094d\u0935\u0928\u093f \u0936\u0940\u0918\u094d\u0930 \u0938\u0941\u0928\u093e\u0908 \u0926\u0947\u0917\u0940\u0964<br \/>\n<strong>\u0915\u093e\u0930\u0923\u0903<\/strong> \u092a\u094d\u0930\u0924\u093f\u0927\u094d\u0935\u0928\u093f \u0915\u093e \u0938\u092e\u092f t = \\(\\frac { 2d }{ \\nu }\\), d= \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u092a\u0943\u0937\u094d\u0920 \u0915\u0940 \u0938\u094d\u0930\u094b\u0924 \u0938\u0947 \u0926\u0942\u0930\u0940<br \/>\n\u091a\u0942\u0901\u0915\u093f \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u092a\u0943\u0937\u094d\u0920 \u0915\u0940 \u0926\u0942\u0930\u0940 (d) \u0938\u094d\u0925\u093f\u0930 \u0939\u0948 \u0907\u0938\u0932\u093f\u090f \u092a\u094d\u0930\u0924\u093f\u0927\u094d\u0935\u0928\u093f \u0915\u093e \u0938\u092e\u092f \u0927\u094d\u0935\u0928\u093f \u0915\u0947 \u091a\u093e\u0932 \u0915\u093e \u0935\u094d\u092f\u0941\u0924\u094d\u0915\u094d\u0930\u092e\u093e\u0928\u0941\u092a\u093e\u0924\u0940 \u0939\u094b\u0917\u093e\u0964 \u0924\u093e\u092a \u092e\u0947\u0902 \u0935\u0943\u0926\u094d\u0927\u093f \u0939\u094b\u0928\u0947 \u092a\u0930 \u0909\u0938 \u092e\u093e\u0927\u094d\u092f\u092e \u092e\u0947\u0902 \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u091a\u093e\u0932 \u092d\u0940 \u092c\u0922\u093c\u0924\u0940 \u0939\u0948\u0964<br \/>\n\u0905\u0924\u0903 \u0905\u0927\u093f\u0915 \u0924\u093e\u092a \u0935\u093e\u0932\u0947 \u0926\u093f\u0928 \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u091a\u093e\u0932 \u0905\u0927\u093f\u0915 \u0939\u094b\u0917\u0940 \u0914\u0930 \u092a\u094d\u0930\u0924\u093f\u0927\u094d\u0935\u0928\u093f \u0936\u0940\u0918\u094d\u0930 \u0938\u0941\u0928\u093e\u0908 \u0926\u0947\u0917\u0940\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 12. \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0915\u0947 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0928 \u0915\u0947 \u0926\u094b \u0935\u094d\u092f\u093e\u0935\u0939\u093e\u0930\u093f\u0915 \u0909\u092a\u092f\u094b\u0917 \u0932\u0940\u0916\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong><br \/>\n<strong>(i) \u092e\u0947\u0917\u093e\u092b\u094b\u0928 \u092f\u093e \u0932\u093e\u0909\u0921\u0938\u094d\u092a\u0940\u0915\u0930, \u0939\u093e\u0930\u094d\u0928 \u0924\u0925\u093e \u0936\u0939\u0928\u093e\u0908 \u091c\u0948\u0938\u0947 \u0935\u093e\u0926\u094d\u092f \u092f\u0902\u0924\u094d\u0930\u0903<\/strong> \u092f\u0947 \u0938\u092d\u0940 \u0907\u0938 \u092a\u094d\u0930\u0915\u093e\u0930 \u092c\u0928\u093e\u090f \u091c\u093e\u0924\u0947 \u0939\u0948\u0902 \u0915\u093f \u0927\u094d\u0935\u0928\u093f \u0938\u092d\u0940 \u0926\u093f\u0936\u093e\u0913\u0902 \u092e\u0947\u0902 \u092b\u0948\u0932\u0947 \u092c\u093f\u0928\u093e \u0915\u0947\u0935\u0932 \u090f\u0915 \u0935\u093f\u0936\u0947\u0937 \u0926\u093f\u0936\u093e \u092e\u0947\u0902 \u0939\u0940 \u091c\u093e\u0924\u0940 \u0939\u0948\u0964 \u092f\u0939 \u0938\u094d\u0930\u094b\u0924 \u0938\u0947 \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0939\u094b\u0928\u0947 \u0935\u093e\u0932\u0940 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0915\u094b \u092c\u093e\u0930-\u092c\u093e\u0930 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u093f\u0924 \u0915\u0930\u0915\u0947 \u0936\u094d\u0930\u094b\u0924\u093e\u0913\u0902 \u0915\u0940 \u0913\u0930 \u0906\u0917\u0947 \u0915\u0940 \u0926\u093f\u0936\u093e \u092e\u0947\u0902 \u092d\u0947\u091c \u0926\u0947\u0924\u093e \u0939\u0948\u0964<\/p>\n<p><strong>(ii) \u0938\u094d\u091f\u0947\u0925\u094b\u0938\u094d\u0915\u094b\u092a:<\/strong> \u092e\u0947\u0902 \u0930\u094b\u0917\u0940 \u0915\u0947 \u0939\u0943\u0926\u092f \u0915\u0940 \u0927\u0921\u093c\u0915\u0928 \u0915\u0940 \u0927\u094d\u0935\u0928\u093f \u092c\u093e\u0930-\u092c\u093e\u0930 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0928 \u0915\u0947 \u0915\u093e\u0930\u0923 \u0921\u0949\u0915\u094d\u091f\u0930 \u0915\u0947 \u0915\u093e\u0928\u094b\u0902 \u0924\u0915 \u092a\u0939\u0941\u0901\u091a\u0924\u0940 \u0939\u0948\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 13. 500 \u092e\u0940\u091f\u0930 \u090a\u0901\u091a\u0940 \u0915\u093f\u0938\u0940 \u092e\u0940\u0928\u093e\u0930 \u0915\u0940 \u091a\u094b\u091f\u0940 \u0938\u0947 \u090f\u0915 \u092a\u0924\u094d\u0925\u0930 \u092e\u0940\u0928\u093e\u0930 \u0915\u0947 \u0906\u0927\u093e\u0930 \u092a\u0930 \u0938\u094d\u0925\u093f\u0924 \u090f\u0915 \u092a\u093e\u0928\u0940 \u0915\u0947 \u0924\u093e\u0932\u093e\u092c \u092e\u0947\u0902 \u0917\u093f\u0930\u093e\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u092a\u093e\u0928\u0940 \u092e\u0947\u0902 \u0907\u0938\u0915\u0947 \u0917\u093f\u0930\u0928\u0947 \u0915\u0940 \u0927\u094d\u0935\u0928\u093f \u091a\u094b\u091f\u0940 \u092a\u0930 \u0915\u092c \u0938\u0941\u0928\u093e\u0908 \u0926\u0947\u0917\u0940? (g = 10 m\/s \u0924\u0925\u093e \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u091a\u093e\u0932 = 340 m\/s)<\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/farm1.staticflickr.com\/851\/30050062358_a5bfbdb97c_o.png?resize=442%2C494&#038;ssl=1\" alt=\"9 Science Chapter 12 Sound study online\" width=\"442\" height=\"494\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 14. \u090f\u0915 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917 339 m\/s \u0915\u0940 \u091a\u093e\u0932 \u0938\u0947 \u091a\u0932\u0924\u0940 \u0939\u0948\u0964 \u092f\u0926\u093f \u0907\u0938\u0915\u0940 \u0924\u0930\u0902\u0917\u0926\u0948\u0930\u094d\u0918\u094d\u092f 1.5 cm \u0939\u094b \u0924\u094b \u0924\u0930\u0902\u0917 \u0915\u0940 \u0906\u0935\u0943\u0924\u094d\u0924\u093f \u0915\u093f\u0924\u0928\u0940 \u0939\u094b\u0917\u0940? \u0915\u094d\u092f\u093e \u092f\u0947 \u0936\u094d\u0930\u0935\u094d\u092f \u0939\u094b\u0917\u0940?<\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1838\/30050062748_323f83f0f4_o.png?resize=428%2C284&#038;ssl=1\" alt=\"9 Science Chapter 12 Sound guide free\" width=\"428\" height=\"284\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 15. \u0905\u0928\u0941\u0930\u0923\u0928 \u0915\u094d\u092f\u093e \u0939\u0948? \u0907\u0938\u0947 \u0915\u0948\u0938\u0947 \u0915\u092e \u0915\u093f\u092f\u093e \u091c\u093e \u0938\u0915\u0924\u093e \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0915\u093f\u0938\u0940 \u092c\u0921\u093c\u0947 \u0939\u0949\u0932 \u092e\u0947\u0902 \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0939\u094b\u0928\u0947 \u0935\u093e\u0932\u0940 \u0927\u094d\u0935\u0928\u093f \u0926\u0940\u0935\u093e\u0930\u094b\u0902 \u0938\u0947 \u092c\u093e\u0930\u0902\u092c\u093e\u0930 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0928 \u0915\u0947 \u0915\u093e\u0930\u0923 \u0915\u093e\u092b\u0940 \u0938\u092e\u092f \u0924\u0915 \u092c\u0928\u0940 \u0930\u0939\u0924\u0940 \u0939\u0948\u0964 \u092f\u0939 \u092c\u093e\u0930\u0902\u092c\u093e\u0930 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0928, \u091c\u093f\u0938\u0915\u0947 \u0915\u093e\u0930\u0923 \u0927\u094d\u0935\u0928\u093f \u0915\u093e \u0938\u094d\u0925\u093e\u092f\u093f\u0924\u094d\u0935 \u0939\u094b\u0924\u093e \u0939\u0948, \u0905\u0928\u0941\u0930\u0923\u0928 (Reverberation) \u0915\u0939\u0932\u093e\u0924\u093e \u0939\u0948\u0964 \u092f\u0939 \u0905\u0935\u093e\u0902\u091b\u0928\u0940\u092f \u0939\u094b\u0924\u093e \u0939\u0948 \u0915\u094d\u092f\u094b\u0902\u0915\u093f \u0905\u0924\u094d\u092f\u0927\u093f\u0915 \u0905\u0928\u0941\u0930\u0923\u0928 \u0915\u0947 \u0915\u093e\u0930\u0923 \u0938\u094d\u092a\u0937\u094d\u091f \u0938\u0941\u0928\u093e\u0908 \u0928\u0939\u0940\u0902 \u0926\u0947\u0924\u093e \u0939\u0948\u0902 \u0905\u0928\u0941\u0930\u0923\u0928 \u0915\u092e \u0915\u0930\u0928\u0947 \u0915\u0947 \u0928\u093f\u092e\u094d\u0928 \u0909\u092a\u093e\u092f \u0939\u0948\u0902:<\/p>\n<ul>\n<li>\u092d\u0935\u0928 \u0915\u0940 \u091b\u0924\u094b\u0902 \u0924\u0925\u093e \u0926\u0940\u0935\u093e\u0930\u094b\u0902 \u092a\u0930 \u0927\u094d\u0935\u0928\u093f \u0905\u0935\u0936\u094b\u0937\u0915 \u092a\u0926\u093e\u0930\u094d\u0925\u094b\u0902 \u091c\u0948\u0938\u0947 \u0938\u0902\u092a\u0940\u0921\u093f\u0924 \u092b\u093e\u0907\u092c\u0930 \u092c\u094b\u0930\u094d\u0921, \u0916\u0941\u0930\u0926\u0930\u0947 \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u0930 \u0905\u0925\u0935\u093e \u092a\u0930\u094d\u0926\u0948 \u0932\u0917\u093e\u0924\u0947 \u0939\u0948\u0902\u0964<\/li>\n<li>\u0938\u0940\u091f\u094b\u0902 \u0915\u0947 \u092a\u0926\u093e\u0930\u094d\u0925\u094b\u0902 \u0915\u093e \u091a\u0941\u0928\u093e\u0935 \u0907\u0928\u0915\u0947 \u0927\u094d\u0935\u0928\u093f \u0905\u0935\u0936\u094b\u0937\u0915 \u0917\u0941\u0923\u094b\u0902 \u0915\u0947 \u0906\u0927\u093e\u0930 \u092a\u0930 \u0915\u0930\u0928\u093e\u0964<\/li>\n<\/ul>\n<p><strong>\u092a\u094d\u0930\u0966 16. \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u092a\u094d\u0930\u092c\u0932\u0924\u093e \u0938\u0947 \u0915\u094d\u092f\u093e \u0905\u092d\u093f\u092a\u094d\u0930\u093e\u092f \u0939\u0948? \u092f\u0939 \u0915\u093f\u0928-\u0915\u093f\u0928 \u0915\u093e\u0930\u0915\u094b\u0902 \u092a\u0930 \u0928\u093f\u0930\u094d\u092d\u0930 \u0915\u0930\u0924\u0940 \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u092a\u094d\u0930\u092c\u0932\u0924\u093e \u0927\u094d\u0935\u0928\u093f \u0915\u0947 \u0932\u093f\u090f \u0915\u093e\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0935\u0947\u0926\u0928\u0936\u0940\u0932\u0924\u093e \u0915\u0940 \u092e\u093e\u092a \u0939\u0948 \u091c\u093f\u0938\u0915\u0947 \u0915\u093e\u0930\u0923 \u092e\u0943\u0926\u0941 \u0927\u094d\u0935\u0928\u093f (Soft sound) \u0924\u0925\u093e \u092a\u094d\u0930\u092c\u0932 \u0927\u094d\u0935\u0928\u093f (Loud sound) \u092e\u0947\u0902 \u0905\u0902\u0924\u0930 \u0915\u0930 \u0938\u0915\u0947\u0964 \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u092a\u094d\u0930\u092c\u0932\u0924\u093e \u0928\u093f\u092e\u094d\u0928\u0932\u093f\u0916\u093f\u0924 \u092a\u0930 \u0928\u093f\u0930\u094d\u092d\u0930 \u0915\u0930\u0924\u0940 \u0939\u0948\u0964<\/p>\n<ul>\n<li>\u0927\u094d\u0935\u0928\u093f \u0915\u0947 \u0926\u094b\u0932\u0928 \u0906\u092f\u093e\u092e (Amplitude of vibration of sound)<\/li>\n<li>\u0915\u093e\u0928\u094b\u0902 \u0915\u0940 \u0938\u0902\u0935\u0947\u0926\u0928\u0936\u0940\u0932\u0924\u093e (Sensitivity of ears)<\/li>\n<\/ul>\n<p><strong>\u092a\u094d\u0930\u0966 17. \u091a\u092e\u0917\u093e\u0926\u0921\u093c \u0905\u092a\u0928\u093e \u0936\u093f\u0915\u093e\u0930 \u092a\u0915\u0921\u093c\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0915\u093e \u0909\u092a\u092f\u094b\u0917 \u0915\u093f\u0938 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u0930\u0924\u093e \u0939\u0948?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u091a\u092e\u0917\u093e\u0926\u0921\u093c \u0909\u0921\u093c\u0924\u0947 \u0938\u092e\u092f \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u0947 \u0909\u0924\u094d\u0938\u0930\u094d\u091c\u093f\u0924 (Emmits) \u0915\u0930\u0924\u093e \u0939\u0948 \u0924\u0925\u093e \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0928 \u0915\u0947 \u092c\u093e\u0926 \u0907\u0928\u0915\u093e \u0938\u0902\u0938\u0942\u091a\u0928 (detect) \u0915\u0930\u0924\u093e \u0939\u0948 \u091a\u092e\u0917\u093e\u0926\u0921\u093c \u0926\u094d\u0935\u093e\u0930\u093e \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0909\u091a\u094d\u091a \u0924\u093e\u0930\u0924\u094d\u0935 \u0915\u0947 \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0938\u094d\u092a\u0902\u0926 \u0905\u0935\u0930\u094b\u0927\u094b\u0902 \u092f\u093e \u0915\u0940\u091f\u094b\u0902 \u0938\u0947 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u093f\u0924 \u0939\u094b\u0915\u0930 \u091a\u092e\u0917\u093e\u0926\u0921\u093c \u0915\u0947 \u0915\u093e\u0928\u094b\u0902 \u0924\u0915 \u092a\u0939\u0941\u0901\u091a\u0924\u093e \u0939\u0948\u0964 \u0907\u0938 \u0924\u0930\u0939 \u091a\u092e\u0917\u093e\u0926\u0921\u093c \u0915\u094b \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u093f\u0924 \u0938\u094d\u092a\u0902\u0926\u094b\u0902 \u0915\u0940 \u092a\u094d\u0930\u0915\u0943\u0924\u093f \u0938\u0947 \u091a\u092e\u0917\u093e\u0926\u0921\u093c \u0915\u094b \u092a\u0924\u093e \u091a\u0932\u0924\u093e \u0939\u0948 \u0915\u093f \u0905\u0935\u0930\u094b\u0927 \u092f\u093e \u0915\u0940\u091f \u0915\u0939\u093e\u0901 \u092a\u0930 \u0939\u0948 \u0914\u0930 \u092f\u0939 \u0915\u093f\u0938 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u093e \u0939\u0948\u0964 \u091a\u092e\u0917\u093e\u0926\u0921\u093c \u0926\u094d\u0935\u093e\u0930\u093e \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0909\u0924\u094d\u0938\u0930\u094d\u091c\u093f\u0924 \u0939\u094b\u0924\u0940 \u0939\u0948 \u0924\u0925\u093e \u0905\u0935\u0930\u094b\u0927 \u092f\u093e \u0915\u0940\u091f\u094b\u0902 \u0926\u094d\u0935\u093e\u0930\u093e \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u093f\u0924 \u0939\u094b\u0924\u0940 \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i2.wp.com\/farm1.staticflickr.com\/856\/28982921737_0bdc0964e3_o.png?resize=421%2C371&#038;ssl=1\" alt=\"Class 9 Science Chapter 12 Intext Questions page 190\" width=\"421\" height=\"371\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 18. \u0935\u0938\u094d\u0924\u0941\u0913\u0902 \u0915\u094b \u0938\u093e\u092b \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0915\u093e \u0909\u092a\u092f\u094b\u0917 \u0915\u0948\u0938\u0947 \u0915\u0930\u0924\u0947 \u0939\u0948\u0902?<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0915\u093e \u0909\u092a\u092f\u094b\u0917 \u0909\u0928 \u092d\u093e\u0917\u094b\u0902 \u0915\u094b \u0938\u093e\u092b \u0915\u0930\u0928\u0947 \u092e\u0947\u0902 \u0915\u0930\u0924\u0947 \u0939\u0948\u0902 \u091c\u093f\u0928 \u0924\u0915 \u092a\u0939\u0941\u0901\u091a\u0928\u093e \u0915\u0920\u093f\u0928 \u0939\u094b\u0924\u093e \u0939\u0948; \u091c\u0948\u0938\u0947\u0903 \u0938\u0930\u094d\u092a\u093f\u0932\u093e\u0915\u093e\u0930 \u0928\u0932\u0940, \u0935\u093f\u0937\u092e \u0906\u0915\u093e\u0930 \u0915\u0947 \u092a\u0941\u0930\u094d\u091c\u0947, \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u0949\u0928\u093f\u0915 \u0905\u0935\u092f\u0935 \u0906\u0926\u093f\u0964 \u0935\u0938\u094d\u0924\u0941\u0913\u0902 \u0915\u094b \u0938\u093e\u092b \u0915\u0930\u0928\u0947 \u0935\u093e\u0932\u0947 \u092e\u093e\u0930\u094d\u091c\u0928 \u0935\u093f\u0932\u092f\u0928 \u092e\u0947\u0902 \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u0947\u0902 \u092d\u0947\u091c\u0940 \u091c\u093e\u0924\u0940 \u0939\u0948\u0902\u0964 \u0909\u091a\u094d\u091a \u0906\u0935\u0943\u0924\u094d\u0924\u093f \u0939\u094b\u0928\u0947 \u0915\u0947 \u0915\u093e\u0930\u0923 \u0927\u0942\u0932, \u091a\u093f\u0915\u0928\u093e\u0908, \u0917\u0902\u0926\u0917\u0940 \u0915\u0947 \u0915\u0923 \u0905\u0932\u0917 \u0939\u094b\u0915\u0930 \u0928\u0940\u091a\u0947 \u0917\u093f\u0930 \u091c\u093e\u0924\u0947 \u0939\u0948\u0902\u0964 \u0907\u0938 \u092a\u094d\u0930\u0915\u093e\u0930 \u0935\u0938\u094d\u0924\u0941 \u092a\u0942\u0930\u094d\u0923\u0924\u092f\u093e \u0938\u093e\u092b \u0939\u094b \u091c\u093e\u0924\u0940 \u0939\u0948\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 19. \u0938\u094b\u0928\u093e\u0930 \u0915\u0940 \u0915\u093e\u0930\u094d\u092f\u0935\u093f\u0927\u093f \u0924\u0925\u093e \u0909\u092a\u092f\u094b\u0917 \u0915\u093e \u0935\u0930\u094d\u0923\u0928 \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u0915\u093e\u0930\u094d\u092f\u0935\u093f\u0927\u093f\u0903 \u0938\u094b\u0928\u093e\u0930 \u092e\u0947\u0902 \u090f\u0915 \u092a\u094d\u0930\u0947\u0937\u093f\u0924 (Transmitter) \u0924\u0925\u093e \u0938\u0902\u0938\u0942\u091a\u0915 (detector) \u0939\u094b\u0924\u093e \u0939\u0948\u0964 \u0907\u0938\u0947 \u0915\u093f\u0938\u0940 \u0928\u093e\u0935 \u092f\u093e \u091c\u0939\u093e\u091c \u092e\u0947\u0902 \u091a\u093f\u0924\u094d\u0930\u093e\u0928\u0941\u0938\u093e\u0930 \u0932\u0917\u093e \u0926\u0947\u0924\u0947 \u0939\u0948\u0902 \u092a\u094d\u0930\u0947\u0937\u093f\u0924 \u0926\u094d\u0935\u093e\u0930\u093e \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u0947\u0902 \u0909\u0924\u094d\u092a\u0928\u094d\u0928 \u0924\u0925\u093e \u092a\u094d\u0930\u0947\u0937\u093f\u0924 \u0915\u0940 \u091c\u093e\u0924\u0940 \u0939\u0948\u0902 \u091c\u094b \u0938\u092e\u0941\u0926\u094d\u0930 \u0924\u0932 \u092e\u0947\u0902 \u0938\u094d\u0925\u093f\u0924 \u0915\u093f\u0938\u0940 \u092a\u093f\u0902\u0921 \u0938\u0947 \u091f\u0915\u0930\u093e\u0915\u0930 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u093f\u0924 \u0939\u094b\u0924\u0940 \u0939\u0948\u0902 \u0914\u0930 \u0938\u0902\u0938\u0942\u091a\u0915 \u0926\u094d\u0935\u093e\u0930\u093e \u0917\u094d\u0930\u0939\u0923 \u0915\u0930 \u0932\u0940 \u091c\u093e\u0924\u0940 \u0939\u0948\u0902\u0964<br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1832\/28982922007_c0b36163a7_o.png?resize=427%2C329&#038;ssl=1\" alt=\"Class 9 Science Chapter 12 Intext Questions page 191\" width=\"427\" height=\"329\" data-recalc-dims=\"1\" \/><br \/>\n<strong>\u0938\u0902\u0938\u0942\u091a\u0915\u0903<\/strong> \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0915\u094b \u0935\u093f\u0926\u094d\u092f\u0941\u0924 \u0938\u0902\u0915\u0947\u0924\u094b\u0902 \u092e\u0947\u0902 \u092c\u0926\u0932 \u0926\u0947\u0924\u093e \u0939\u0948 \u091c\u093f\u0928\u0915\u0940 \u0909\u091a\u093f\u0924 \u0930\u0942\u092a \u0938\u0947 \u0935\u094d\u092f\u093e\u0916\u094d\u092f\u093e \u0915\u0930 \u0932\u0940 \u091c\u093e\u0924\u0940 \u0939\u0948\u0964<br \/>\n\u092e\u093e\u0928 \u0932\u0940\u091c\u093f\u090f \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0938\u0902\u0915\u0947\u0924\u094b\u0902 \u0915\u0947 \u092a\u094d\u0930\u0947\u0937\u0923 \u0924\u0925\u093e \u0905\u092d\u093f\u0917\u094d\u0930\u0939\u0923 \u0915\u093e \u0938\u092e\u092f\u093e\u0902\u0924\u0930\u093e\u0932 = t \u0939\u0948\u0964<br \/>\n\u0938\u092e\u0941\u0926\u094d\u0930\u0940 \u091c\u0932 \u092e\u0947\u0902 \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u091a\u093e\u0932 = \u03c5 \u0939\u0948\u0964<br \/>\n\u0924\u092c \u0938\u0924\u0939 \u0938\u0947 \u092a\u093f\u0902\u0921 \u0915\u0940 \u090f\u0915 \u0924\u0930\u092b \u0915\u0940 \u0926\u0942\u0930\u0940 (\u092f\u093e \u0917\u0939\u0930\u093e\u0908) = d<br \/>\n\u0938\u0924\u0939 \u0938\u0947 \u092a\u093f\u0902\u0921 \u0924\u0915 \u0924\u0925\u093e \u0935\u093e\u092a\u0938 \u0938\u0924\u0939 \u0924\u0915 \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0926\u094d\u0935\u093e\u0930\u093e \u091a\u0932\u0940 \u0917\u0908 \u0926\u0942\u0930\u0940 = 2d \u0939\u094b\u0917\u0940<br \/>\n\u0926\u0942\u0930\u0940 = \u091a\u093e\u0932 x \u0938\u092e\u092f<br \/>\n\u21d2 2d = \u03c5 x t<br \/>\n\u21d2 d = \\(\\frac { \\nu \\quad \\times \\quad t }{ 2 }\\) &#8230;(1)<br \/>\n<strong>\u0909\u092a\u092f\u094b\u0917\u0903<\/strong> \u0909\u092a\u0930\u094d\u092f\u0941\u0915\u094d\u0924 \u0938\u092e\u0940\u0915\u0930\u0923 \u092e\u0947\u0902 &#8216;V&#8217; \u0924\u0925\u093e &#8216;t&#8217; \u0915\u0947 \u092e\u093e\u0928 \u092a\u094d\u0930\u0924\u093f\u0938\u094d\u0925\u093e\u092a\u093f\u0924 \u0915\u0930 \u0939\u092e &#8216;d \u091c\u094d\u091e\u093e\u0924 \u0915\u0930 \u0932\u0947\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n(i) \u0938\u092e\u0941\u0926\u094d\u0930 \u0915\u0940 \u0917\u0939\u0930\u093e\u0908 \u091c\u094d\u091e\u093e\u0924 \u0915\u0930\u0928\u0947 \u092e\u0947\u0902<br \/>\n(ii) \u091c\u0932 \u0915\u0947 \u0905\u0902\u0926\u0930 \u0938\u094d\u0925\u093f\u0924 \u091a\u091f\u094d\u091f\u093e\u0928\u094b\u0902, \u0918\u093e\u091f\u093f\u092f\u094b\u0902, \u092a\u0928\u0921\u0941\u092c\u094d\u092c\u093f\u092f\u094b\u0902, \u0939\u093f\u092e\u0936\u0948\u0932 (\u092a\u094d\u0932\u093e\u0935\u0940 \u092c\u0930\u094d\u092b\u093c), \u0921\u0942\u092c\u0947 \u0939\u0941\u090f \u091c\u0939\u093e\u091c \u0906\u0926\u093f \u0915\u0940 \u091c\u093e\u0928\u0915\u093e\u0930\u0940 \u092a\u094d\u0930\u093e\u092a\u094d\u0924 \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0915\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964<\/p>\n<p><strong>\u092a\u094d\u0930\u0966 20. \u090f\u0915 \u092a\u0928\u0921\u0941\u092c\u094d\u092c\u0940 \u092a\u0930 \u0932\u0917\u0940 \u090f\u0915 \u0938\u094b\u0928\u093e\u0930 \u092f\u0941\u0915\u094d\u0924\u093f, \u0938\u0902\u0915\u0947\u0924 \u092d\u0947\u091c\u0924\u0940 \u0939\u0948 \u0914\u0930 \u0909\u0928\u0915\u0940 \u092a\u094d\u0930\u0924\u093f\u0927\u094d\u0935\u0928\u093f 5s \u092a\u0936\u094d\u091a\u093e\u0924\u094d \u0917\u094d\u0930\u0939\u0923 \u0915\u0930\u0924\u0940 \u0939\u0948\u0964 \u092f\u0926\u093f \u092a\u0928\u0921\u0941\u092c\u094d\u092c\u0940 \u0938\u0947 \u0935\u0938\u094d\u0924\u0941 \u0915\u0940 \u0926\u0942\u0930\u0940 3626 m \u0939\u094b \u0924\u094b \u0927\u094d\u0935\u0928\u093f \u0915\u0940 \u091a\u093e\u0932 \u0915\u0940 \u0917\u0923\u0928\u093e \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i1.wp.com\/farm1.staticflickr.com\/859\/28982922137_d85eb1bbca_o.png?resize=407%2C194&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 12 Sound Exercises Question answers in pdf form\" width=\"407\" height=\"194\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 21. \u0915\u093f\u0938\u0940 \u0927\u093e\u0924\u0941 \u0915\u0947 \u092c\u094d\u0932\u0949\u0915 \u092e\u0947\u0902 \u0926\u094b\u0937\u094b\u0902 \u0915\u093e \u092a\u0924\u093e \u0932\u0917\u093e\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0915\u093e \u0909\u092a\u092f\u094b\u0917 \u0915\u0948\u0938\u0947 \u0915\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948, \u0935\u0930\u094d\u0923\u0928 \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0915\u094b \u0927\u093e\u0924\u0941 \u0915\u0947 \u092c\u094d\u0932\u0949\u0915 \u0938\u0947 \u092a\u094d\u0930\u0947\u0937\u093f\u0924 \u0915\u0940 \u091c\u093e\u0924\u0940 \u0939\u0948 \u0914\u0930 \u092a\u094d\u0930\u0947\u0937\u093f\u0924 \u0924\u0930\u0902\u0917\u094b\u0902 \u0915\u093e \u092a\u0924\u093e \u0932\u0917\u093e\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0938\u0902\u0938\u0942\u091a\u0915\u094b\u0902 (Detectors) \u0915\u093e \u0909\u092a\u092f\u094b\u0917 \u0915\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u092f\u0926\u093f \u0925\u094b\u0921\u093c\u093e-\u0938\u093e \u092d\u0940 \u0926\u094b\u0937 \u0939\u094b\u0924\u093e \u0939\u0948 \u0924\u094b \u092a\u0930\u093e\u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u0947\u0902 \u0935\u093e\u092a\u0938 \u092a\u0930\u093e\u0935\u0930\u094d\u0924\u093f\u0924 \u0939\u094b \u091c\u093e\u0924\u0940 \u0939\u0948\u0902 \u091c\u094b \u0915\u093f \u0927\u093e\u0924\u0941 \u092c\u094d\u0932\u093e\u0915 \u092e\u0947\u0902 \u0926\u094b\u0937 \u0915\u0940 \u0909\u092a\u0938\u094d\u0925\u093f\u0924\u093f \u0926\u0930\u094d\u0936\u093e\u0924\u0940 \u0939\u0948\u0902\u0964<br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1780\/43919455331_99b34a553c_o.png?resize=381%2C217&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 12 Sound Exercises Question answers for up board high school\" width=\"381\" height=\"217\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>\u092a\u094d\u0930\u0966 22. \u092e\u0928\u0941\u0937\u094d\u092f \u0915\u093e \u0915\u093e\u0928 \u0915\u093f\u0938 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u093e\u0930\u094d\u092f \u0915\u0930\u0924\u093e \u0939\u0948? \u0935\u093f\u0935\u0947\u091a\u0928\u093e \u0915\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>\u0909\u0924\u094d\u0924\u0930-<\/strong> \u092c\u093e\u0939\u0930\u0940 \u0915\u093e\u0928 &#8216;\u0915\u0930\u094d\u0923 \u092a\u0932\u094d\u0932\u0935&#8217; \u0915\u0939\u0932\u093e\u0924\u093e \u0939\u0948\u0964 \u092f\u0939 \u0906\u0938\u092a\u093e\u0938 \u0915\u0947 \u092a\u0930\u093f\u0935\u0947\u0936 \u0938\u0947 \u0927\u094d\u0935\u0928\u093f \u090f\u0915\u0924\u094d\u0930\u093f\u0924 \u0915\u0930\u0924\u093e \u0939\u0948\u0964 \u090f\u0915\u0924\u094d\u0930\u093f\u0924 \u0927\u094d\u0935\u0928\u093f \u0936\u094d\u0930\u0935\u0923 \u0928\u093e\u0932\u093f\u0915\u093e \u0938\u0947 \u0917\u0941\u091c\u0930\u0924\u0940 \u0939\u0948\u0964 \u0936\u094d\u0930\u0935\u0923 \u0928\u093e\u0932\u093f\u0915\u093e \u0915\u0947 \u0938\u093f\u0930\u0915 \u092a\u0930 \u090f\u0915 \u092a\u0924\u0932\u0940 \u091d\u093f\u0932\u094d\u0932\u0940 \u0939\u094b\u0924\u0940 \u0939\u0948 \u091c\u093f\u0938\u0947 \u0915\u0930\u094d\u0923 \u092a\u091f\u0932 \u092f\u093e \u0915\u0930\u094d\u0923 \u092a\u091f\u0939 \u091d\u093f\u0932\u094d\u0932\u0940 \u0915\u0939\u0924\u0947 \u0939\u0948\u0902\u0964 \u091c\u092c \u092e\u093e\u0927\u094d\u092f\u092e \u0915\u0947 \u0938\u0902\u092a\u0940\u0921\u0928 \u0915\u0930\u094d\u0923 \u092a\u091f\u0939 \u0924\u0915 \u092a\u0939\u0941\u0901\u091a\u0924\u0947 \u0939\u0948\u0902 \u0924\u094b \u091d\u093f\u0932\u094d\u0932\u0940 \u0915\u0947 \u092c\u093e\u0939\u0930 \u0915\u0940 \u0913\u0930 \u0932\u0917\u0928\u0947 \u0935\u093e\u0932\u093e \u0926\u093e\u092c \u092c\u0922\u093c \u091c\u093e\u0924\u093e \u0939\u0948 \u0914\u0930 \u092f\u0939 \u0915\u0930\u094d\u0923 \u092a\u091f\u0939 \u0915\u094b \u0905\u0902\u0926\u0930 \u0915\u0940 \u0913\u0930 \u0926\u092c\u093e\u0924\u093e \u0939\u0948\u0964 \u0907\u0938\u0940 \u092a\u094d\u0930\u0915\u093e\u0930, \u0935\u093f\u0930\u0932\u0928\u0947 \u0915\u0947 \u092a\u0939\u0941\u0901\u091a\u0928\u0947 \u092a\u0930 \u0915\u0930\u094d\u0923 \u092a\u091f\u0939 \u092c\u093e\u0939\u0930 \u0915\u0940 \u0913\u0930 \u0917\u0924\u093f \u0915\u0930\u0924\u093e \u0939\u0948\u0964 \u0907\u0938 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u0930\u094d\u0923 \u092a\u091f\u0939 \u0915\u0902\u092a\u0928 \u0915\u0930\u0924\u093e \u0939\u0948\u0964 \u092e\u0927\u094d\u092f \u0915\u0930\u094d\u0923 \u092e\u0947\u0902 \u0935\u093f\u0926\u094d\u092f\u092e\u093e\u0928 \u0924\u0940\u0928 \u0939\u0921\u094d\u0921\u093f\u092f\u093e\u0901\u0964 (\u092e\u0941\u0917\u094d\u0926\u0930\u0915, \u0928\u093f\u0939\u093e\u0908 \u0924\u0925\u093e \u0935\u0932\u092f\u0915 (\u0938\u094d\u091f\u093f\u0930\u092a)\u0964 \u0907\u0928 \u0915\u0902\u092a\u0928\u094b\u0902 \u0915\u094b \u0915\u0908 \u0917\u0941\u0928\u093e \u092c\u0922\u093c\u093e \u0926\u0947\u0924\u0940 \u0939\u0948\u0902\u0964 \u092e\u0927\u094d\u092f \u0915\u0930\u094d\u0923 \u0927\u094d\u0935\u0928\u093f \u0924\u0930\u0902\u0917\u094b\u0902 \u0938\u0947 \u092e\u093f\u0932\u0928\u0947 \u0935\u093e\u0932\u0947 \u0907\u0928 \u0926\u093e\u092c\u0947 \u092a\u0930\u093f\u0935\u0930\u094d\u0924\u0928\u094b\u0902 \u0915\u094b \u0906\u0902\u0924\u0930\u093f\u0915 \u0915\u0930\u094d\u0923 \u0924\u0915 \u0938\u0902\u091a\u0930\u093f\u0924 \u0915\u0930 \u0926\u0947\u0924\u093e \u0939\u0948\u0964 \u0906\u0902\u0924\u0930\u093f\u0915 \u0915\u0930\u094d\u0923 \u092e\u0947\u0902 \u0915\u0930\u094d\u0923\u093e\u0935\u0930\u094d\u0924 Cochlea) \u0926\u094d\u0935\u093e\u0930\u093e \u0926\u093e\u092c \u092a\u0930\u093f\u0935\u0930\u094d\u0924\u0928\u094b\u0902 \u0915\u094b \u0935\u093f\u0926\u094d\u092f\u0941\u0924 \u0938\u0902\u0915\u0947\u0924\u094b\u0902 \u0915\u094b \u0936\u094d\u0930\u0935\u0923 \u0924\u0902\u0924\u094d\u0930\u093f\u0915\u093e \u0926\u094d\u0935\u093e\u0930\u093e \u092e\u0938\u094d\u0924\u093f\u0937\u094d\u0915 \u0924\u0915 \u092d\u0947\u091c \u0926\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948 \u0914\u0930 \u092e\u0938\u094d\u0924\u093f\u0937\u094d\u0915 \u0907\u0928\u0915\u0940 \u0927\u094d\u0935\u0928\u093f \u0915\u0947 \u0930\u0942\u092a \u092e\u0947\u0902 \u0935\u094d\u092f\u093e\u0916\u094d\u092f\u093e \u0915\u0930\u0924\u093e \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1818\/43919455601_eebc9c1944_o.png?resize=369%2C378&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Science Chapter 12 Sound Exercises Question answers for mp and gujrat board\" width=\"369\" height=\"378\" data-recalc-dims=\"1\" \/><\/p>\n<p>Hope given NCERT Solutions for Class 9 Science Chapter 12\u00a0are helpful to complete your homework.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium) These Solutions are part of NCERT Solutions for Class 9 Science in Hindi Medium. Here we have given NCERT Solutions for Class 9 Science Chapter 12 Sound. \u092a\u093e\u0920\u0917\u0924 \u0939\u0932 \u092a\u094d\u0930\u0936\u094d\u0928 (NCERT IN-TEXT QUESTIONS SOLVED) NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 182) \u092a\u094d\u0930\u0966 1. \u0915\u093f\u0938\u0940 \u092e\u093e\u0927\u094d\u092f\u092e \u092e\u0947\u0902 &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-12-hindi\/\"> <span class=\"screen-reader-text\">NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium)<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":7160,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[6],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v16.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium) - NCERT Solutions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-12-hindi\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium) - NCERT Solutions\" \/>\n<meta property=\"og:description\" content=\"NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium) These Solutions are part of NCERT Solutions for Class 9 Science in Hindi Medium. Here we have given NCERT Solutions for Class 9 Science Chapter 12 Sound. \u092a\u093e\u0920\u0917\u0924 \u0939\u0932 \u092a\u094d\u0930\u0936\u094d\u0928 (NCERT IN-TEXT QUESTIONS SOLVED) NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 182) \u092a\u094d\u0930\u0966 1. \u0915\u093f\u0938\u0940 \u092e\u093e\u0927\u094d\u092f\u092e \u092e\u0947\u0902 &hellip; NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium) Read More &raquo;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-12-hindi\/\" \/>\n<meta property=\"og:site_name\" content=\"NCERT Solutions\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/NCERTSolutionsGuru\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-07-23T05:26:28+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-07-23T06:51:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-12-Sound-Hindi-Medium.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ncertsolguru\" \/>\n<meta name=\"twitter:site\" content=\"@ncertsolguru\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Prasanna\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Organization\",\"@id\":\"https:\/\/ncertsolutions.guru\/#organization\",\"name\":\"NCERT Solutions\",\"url\":\"https:\/\/ncertsolutions.guru\/\",\"sameAs\":[\"https:\/\/www.facebook.com\/NCERTSolutionsGuru\/\",\"https:\/\/www.instagram.com\/ncertsolutionsguru\/\",\"https:\/\/www.linkedin.com\/in\/ncertsolutionsguru\/\",\"https:\/\/in.pinterest.com\/ncertsolutionsguru\/\",\"https:\/\/en.wikipedia.org\/wiki\/National_Council_of_Educational_Research_and_Training\",\"https:\/\/twitter.com\/ncertsolguru\"],\"logo\":{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/ncertsolutions.guru\/#logo\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/i1.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2020\/05\/NCERT-Solutions.png?fit=460%2C45&ssl=1\",\"contentUrl\":\"https:\/\/i1.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2020\/05\/NCERT-Solutions.png?fit=460%2C45&ssl=1\",\"width\":460,\"height\":45,\"caption\":\"NCERT Solutions\"},\"image\":{\"@id\":\"https:\/\/ncertsolutions.guru\/#logo\"}},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/ncertsolutions.guru\/#website\",\"url\":\"https:\/\/ncertsolutions.guru\/\",\"name\":\"NCERT Solutions\",\"description\":\"NCERT Solutions for Class 1 to 12\",\"publisher\":{\"@id\":\"https:\/\/ncertsolutions.guru\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/ncertsolutions.guru\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-12-hindi\/#primaryimage\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/i0.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-12-Sound-Hindi-Medium.png?fit=1280%2C720&ssl=1\",\"contentUrl\":\"https:\/\/i0.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-12-Sound-Hindi-Medium.png?fit=1280%2C720&ssl=1\",\"width\":1280,\"height\":720,\"caption\":\"NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium)\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-12-hindi\/#webpage\",\"url\":\"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-12-hindi\/\",\"name\":\"NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium) - 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Here we have given NCERT Solutions for Class 9 Science Chapter 12 Sound. \u092a\u093e\u0920\u0917\u0924 \u0939\u0932 \u092a\u094d\u0930\u0936\u094d\u0928 (NCERT IN-TEXT QUESTIONS SOLVED) NCERT \u092a\u093e\u0920\u094d\u092f\u092a\u0941\u0938\u094d\u0924\u0915 (\u092a\u0943\u0937\u094d\u0920 \u0938\u0902\u0916\u094d\u092f\u093e 182) \u092a\u094d\u0930\u0966 1. \u0915\u093f\u0938\u0940 \u092e\u093e\u0927\u094d\u092f\u092e \u092e\u0947\u0902 &hellip; NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium) Read More &raquo;","og_url":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-12-hindi\/","og_site_name":"NCERT Solutions","article_publisher":"https:\/\/www.facebook.com\/NCERTSolutionsGuru\/","article_published_time":"2021-07-23T05:26:28+00:00","article_modified_time":"2021-07-23T06:51:49+00:00","og_image":[{"width":1280,"height":720,"url":"https:\/\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-12-Sound-Hindi-Medium.png","path":"\/home\/412375.cloudwaysapps.com\/bmvvpkvjjm\/public_html\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-12-Sound-Hindi-Medium.png","size":"full","id":7160,"alt":"NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium)","pixels":921600,"type":"image\/png"}],"twitter_card":"summary_large_image","twitter_creator":"@ncertsolguru","twitter_site":"@ncertsolguru","twitter_misc":{"Written by":"Prasanna","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Organization","@id":"https:\/\/ncertsolutions.guru\/#organization","name":"NCERT Solutions","url":"https:\/\/ncertsolutions.guru\/","sameAs":["https:\/\/www.facebook.com\/NCERTSolutionsGuru\/","https:\/\/www.instagram.com\/ncertsolutionsguru\/","https:\/\/www.linkedin.com\/in\/ncertsolutionsguru\/","https:\/\/in.pinterest.com\/ncertsolutionsguru\/","https:\/\/en.wikipedia.org\/wiki\/National_Council_of_Educational_Research_and_Training","https:\/\/twitter.com\/ncertsolguru"],"logo":{"@type":"ImageObject","@id":"https:\/\/ncertsolutions.guru\/#logo","inLanguage":"en-US","url":"https:\/\/i1.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2020\/05\/NCERT-Solutions.png?fit=460%2C45&ssl=1","contentUrl":"https:\/\/i1.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2020\/05\/NCERT-Solutions.png?fit=460%2C45&ssl=1","width":460,"height":45,"caption":"NCERT Solutions"},"image":{"@id":"https:\/\/ncertsolutions.guru\/#logo"}},{"@type":"WebSite","@id":"https:\/\/ncertsolutions.guru\/#website","url":"https:\/\/ncertsolutions.guru\/","name":"NCERT Solutions","description":"NCERT Solutions for Class 1 to 12","publisher":{"@id":"https:\/\/ncertsolutions.guru\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/ncertsolutions.guru\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"ImageObject","@id":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-12-hindi\/#primaryimage","inLanguage":"en-US","url":"https:\/\/i0.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-12-Sound-Hindi-Medium.png?fit=1280%2C720&ssl=1","contentUrl":"https:\/\/i0.wp.com\/ncertsolutions.guru\/wp-content\/uploads\/2018\/08\/NCERT-Solutions-for-Class-9-Science-Chapter-12-Sound-Hindi-Medium.png?fit=1280%2C720&ssl=1","width":1280,"height":720,"caption":"NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium)"},{"@type":"WebPage","@id":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-12-hindi\/#webpage","url":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-9-science-chapter-12-hindi\/","name":"NCERT Solutions for Class 9 Science Chapter 12 Sound (Hindi Medium) - 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