A man is standing at a distance of 12 m from a cliff. Will be he able to hear a clear echo of his sound ? Give a reason for your answer.

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Solution

No the person will not be able to hear an echo because the minimum distance between the source of sound and the reflecting surface should be 17m.
Explanation: we can hear two sounds separately if the time gap between these two sounds is more than 1/10 th of a second.
distance=speedtime
3440.1=34.4m

so echo will be heard if the minimum distance between the source and the obstacle is $fraction numerator 34.4 over denominator 2 end fraction$ =17.2m

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Standard IX Physics

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