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The lesson covers the complete explanation of class 8 Chapter 13 Sound. This document is highly rated by Class 8 students and has been viewed 4021 times. The Class 8 Science Chapter 13 solution provides a deep understanding of the students and gives them more insights into the chapter. Study material like concept maps, important … Sound: Vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear.. Musical Sound: The sound which produce a pleasing effect on the ear. Filed Under: Class 8, NCERT Solutions, Science Tagged With: answer, Chapter 13, class 8, friction, NCERT, NCERT Solutions, science About Mrs Shilpi Nagpal Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. Class 8 Science Notes. NCERT Solutions for Class 8. The entire NCERT textbook questions have been solved by best teachers for you. 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