Questions
The minimum distance of reflector surface from the source for listening the echo of sound is (speed of sound = 332 m/s)
a
28 m
b
18 m
c
19 m
d
16.5 m
detailed solution
Correct option is D
2d=v×t, where v = velocity of sound = 332 m/s t = Persistence of hearing = 110sec. ⇒d=v×t2=332×1102=16.5 mTalk to our academic expert!
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