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

220m

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247.5m

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268.5m

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292.5m

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Solution

The correct option is A 247.5m
The distance traveled by sound for echo is:
$2 x = s p e e d o f s o u n d \times t i m e o f e c h o$
$x = \frac{1}{2} \times 330 \times 1.5 = 247.5 m$

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A man fires a gun & hears an echo from a hill after 5s. He then moves 200m towards the hill & then fires again. This time he hears an echo after 3.78s. Calculate i) velocity of sound in air ii) distance between the original position of man & the hill.

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

The correct option is A 247.5mThe distance traveled by sound for echo is:2x=speed of sound×time of echox=12×330×1.5=247.5 m

The correct option is A 247.5m
The distance traveled by sound for echo is:
$2 x = s p e e d o f s o u n d \times t i m e o f e c h o$
$x = \frac{1}{2} \times 330 \times 1.5 = 247.5 m$