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What is reverberation? How can it be reduced?

Sound Class 9 Physics
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A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, g = 10 m s–2 and speed of sound = 340 m s–1 .

Class 9 Physics Sound
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Give two practical applications of reflection of sound waves.

Class 9 Physics Sound
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The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

Class 9 Physics Sound
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Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

Class 9 Physics Sound
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A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m s–1?

Class 9 Physics Sound
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Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?

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.

Sound Class 9 Physics
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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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