On a warm day at the speed of sound in air is

PHYSICS · Subjective · CBSE · Physics · Sound · Sound

Problem

On a warm day at

30^{\circ}\text{C}

the speed of sound in air is

349\,\text{m/s}

. A boy stands

150\,\text{m}

in front of a high wall and shouts. How long after shouting will he hear the echo of his own voice? (Give your answer to the nearest millisecond.)