A man, standing between two cliffs, claps his hands and starts hearing a series of echoes at intervals of one second. If the speed of sound in air is 340 `ms^(-1)`, the distance between the cliff is

Options

A. 680m
B. 1700m
C. 340m
D. 1620m

Answer

C

Explanation

Let the man hear first echo of claps after reflecting from cliff A. Thus the sound wave covers distance `2(d//2)`.
`therefore`   `2(d//2)=vxxt`
`rArr`   d=340m.