A man standing on a cliff claps his hand and hears its echo after $1\text{ s}$. If sound is reflected from…
A man standing on a cliff claps his hand and hears its echo after $1\text{ s}$. If sound is reflected from mountain and velocity of sound in air is $340\text{ ms}^{-1}$. Then, the distance between the man and reflection point is
680 m
340 m
85 m
170 m
Solution
If $d$ is the distance between man and reflecting surface of sound, then for hearing echo,
$2d = v \times t \Rightarrow d = \frac{340 \times 1}{2} = 170\text{ m}$