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Answer to Question #13551 in Acoustics for Awais

Question #13551
q) In order to hear the echo of a sound, the minimum distance between the listener and the obstacle must be??( v of air is 332)
a.33m
b.17m
c.9.5m
d.8.5m
Expert's answer
When dealing with audible frequencies, the human ear cannot distinguish an echo from the original sound if the delay is less than 1/10 of a second. Thus, since the velocity of sound is 340 m/s, the reflecting object must be more than 340/10/2 = 17 m from the sound source. So, the right answer is b.

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