First slide

Introduction to waves

Question

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)

Easy

A

220 m
B

247.5 m
C

268.5 m
D

292.5 m

Solution

If d is the distance between man and reflecting surface of sound then for hearing echo
$2 d = v \times t \Rightarrow d = \frac{330 \times 1 .5}{2} = 247 .5 m$

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