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प्रश्न
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उत्तर
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संबंधित प्रश्न
Define frequency term in relation to a wave.
State two differences between the light and sound waves.
Name the principle on which a soundboard works.
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
(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?
What is meant by an echo? Explain.
