First slide

Travelling wave

Question

A man standing on a cliff claps his hand hears its echo after 1 sec. If sound is reflected from another mountain and velocity of sound in air is 340 m/sec. Then the distance between the man and reflection point is

Easy

A

680 m
B

340 m
C

85 m
D

170 m

Solution

If d is the distance between man and reflecting surface of sound then for hearing echo
$2 d = v \times t \Rightarrow d = \frac{340 \times 1}{2} = 170 m$

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