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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.
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संबंधित प्रश्न
State two factors on which the speed of a wave travelling in a medium depends.
Name two sound absorbing materials (or objects) which can make our big room less echoey.
Explain how the principle of echo is used by
The bat during its flight at
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.
What are mechanical waves?
How are bats able to fly in the dark?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 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.
