A swimmer underwater is 120 ,m in front of a vertical pool wall

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

Problem

A swimmer underwater is 120\,m in front of a vertical pool wall. If the speed of sound in water is

1500\,\text{m/s}

, how much time after striking a metal plate will the swimmer hear the echo? (a)

0.08\,\text{s}

(b)

0.70\,\text{s}

(c)

0.16\,\text{s}

(d)

0.32\,\text{s}