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