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Category: Physics
How is ultrasound used for cleaning?
Class 9
Physics
Sound
21/03/2022
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Explain how bats use ultrasound to catch a prey.
Class 9
Physics
Sound
21/03/2022
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What is loudness of sound? What factors does it depend on?
Sound
Class 9
Physics
21/03/2022
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What is reverberation? How can it be reduced?
Class 9
Physics
Sound
21/03/2022
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A sound wave travels at a speed of 339 m s–1. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?
Class 9
Physics
Sound
21/03/2022
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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
21/03/2022
Read More
Give two practical applications of reflection of sound waves.
Class 9
Physics
Sound
21/03/2022
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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
21/03/2022
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Does sound follow the same laws of reflection as light does? Explain.
Sound
Class 9
Physics
21/03/2022
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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
21/03/2022
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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.
Sound
Class 9
Physics
15/03/2022
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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
15/03/2022
Read More
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