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Q.

The echo of a gun shot is heard 8 sec after the gun is fired. How far from him is the surface that reflects the sound (velocity of sound in air = 350 m/s)

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a

1400 m

b

2800 m

c

700 m

d

350 m

answer is A.

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Detailed Solution

Suppose the distance between shooter and reflecting surface is d. Hence time interval for hearing echo is t=2dv⇒8=2d350⇒d=1400 m.
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