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प्रश्न
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
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उत्तर
The echo will not be heard because the minimum distance between the source and the reflecting surface should be 17 m.
संबंधित प्रश्न
A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.
1) Calculate the speed with which this sound travels
2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?
State two differences between the light and sound waves.
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.
State two factors on which the natural frequency of a body depends.
Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms−1?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?
Write short notes on reflection of sound waves from plane and curved surfaces.
