A student stands midway between two parallel

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

Problem

A student stands midway between two parallel, large, vertical concrete walls and claps loudly. He hears the first echo after

0.20\,\text{s}

and the second echo after another

0.20\,\text{s}

. If the speed of sound is

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

, what is the separation between the two walls? (a)

102\,\text{m}

(b)

68\,\text{m}

(c)

34\,\text{m}

(d)

136\,\text{m}