The echo of a gun shot is heard 8 sec. a...

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 )

1400 m

2800 m

700 m

350 m

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Verified by Experts

The correct Answer is:

Suppose the distance between shooter and reflecting surface is d. Hence, time interval hearing echo is
`t=(2d)/(v)`
`rArr 8=(2d)/(350)`
`rArr =1400m`

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