Physics

Problem

A boy standing near a vertical cliff claps his hands and hears the echo after

4.0\,\text{s}

. If the speed of sound in air is

340\,\text{m/s}

, how far is he from the cliff? a)

1360\,\text{m}

680\,\text{m}

340\,\text{m}

660\,\text{m}