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Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?

Class 9 Physics Sound
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Why is sound wave called a longitudinal wave?

Sound Class 9 Physics
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Cite an experiment to show that sound needs a material medium for its propagation.

Class 9 Physics Sound
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Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.

Class 9 Physics Sound
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What is sound and how is it produced?

Class 9 Physics Sound
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A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?

Class 9 Physics Sound
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What is the range of frequencies associated with (a) Infrasound? (b) Ultrasound?

Class 9 Physics Sound
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What is the audible range of the average human ear?

Sound Class 9 Physics
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Why are the ceilings of concert halls curved?

Sound Class 9 Physics
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An echo is heard in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s–1?

Class 9 Physics Sound
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In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?

Sound Class 9 Physics
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Distinguish between loudness and intensity of sound.

Sound Class 9 Physics
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