Physics
A man is standing at a distance of 12 m from a cliff. Will he be able to hear a clear echo of his sound ? Give a reason for your answer.
Sound
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Answer
As we know,
Total distance travelled by the sound in going and then coming back = 2d
Given,
d = 12 m
V = 340 ms-1
Substituting the values in the formula above, we get,
Hence, time = 0.07 s.
An important condition for hearing an echo is that the reflected sound should reach the ear only after a lapse of at least 0.1 s after the original sound dies off.
The time in this case is less than 0.1 s. Hence, the man will not hear the echo.
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