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Q.

A man stands in front of a hillock and fires a gun. He hears an echo after 1.5 sec. The distance of the hillock from the man is (velocity of sound in air is 330 m/s)

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a

220 m

b

247.5 m

c

268.5 m

d

292.5 m

answer is B.

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Detailed Solution

If d is the distance between man and reflecting surface of sound then for hearing echo 2d=v×t⇒d=330×1.52=247.5 m
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