A boy standing midway between two tall

PHYSICS · Single correct · CBSE · Physics · Sound · Sound

Problem

A boy standing midway between two tall, parallel cliff faces claps his hands once every

0.50\,\text{s}

. If the speed of sound in air is

340\,\text{m}\,\text{s}^{-1}

, what is the greatest distance he can stand from each cliff so that the echo of any clap returns before he produces the next clap? (a)

34\,\text{m}

(b)

85\,\text{m}

(c)

170\,\text{m}

(d)

42.5\,\text{m}