Question

A person hears an echo from an hill after 12s, then time for hearing an echo if distance between him and hill is reduced to half, then time for hearing an echo in s will be _______​

Answer 1

Answer:

It will be 24 seconds

Explanation:

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Answer 2

As the sensation of sound persists in our brain for about 0.1 s, to hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1s. If we take the speed of sound to be 344 m/s at a given temperature, say at 22 ºC in air, sound must go to the obstacle and reach back the ear of the listener on reflection after 0.1s.

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