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Q.

The minimum distance of reflector surface from the source for listening the echo of sound is (speed of sound = 332 m/s)

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a

28 m

b

18 m

c

19 m

d

16.5 m

answer is D.

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Detailed Solution

2d=v×t, where v = velocity of sound = 332 m/s t = Persistence of hearing = 110sec. ⇒d=v×t2=332×1102=16.5 m
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