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How is ultrasound used for cleaning?

Class 9 Physics Sound
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Explain how bats use ultrasound to catch a prey.

Sound Class 9 Physics
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What is loudness of sound? What factors does it depend on?

Sound Class 9 Physics
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What is reverberation? How can it be reduced?

Class 9 Physics Sound
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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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When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?

Class 9 Physics Sound
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Does sound follow the same laws of reflection as light does? Explain.

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?

Sound Class 9 Physics
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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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