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Q.

For the human ear to detect the echo, the minimum time period of hearing the echo between the reflecting surface and the ear must be ____ seconds.


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Detailed Solution

For the human ear to detect the echo, the time period of hearing the echo between the reflecting surface and the ear must be 0.1 seconds.
The human ear can distinguish different sounds separately only if the time gap between these two sounds is 0.1 seconds. Or we can say that a sound can persist in our mind only for 0.1 seconds. So to hear an echo, there should be a time period of 0.1 seconds between the sound from the source and the reflected sound.
 
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