Physics

Problem

A boy standing in front of a cliff shouts and hears the echo of his voice

2.4\,\text{s}

later. If the speed of sound in air is

340\,\text{m/s}

, how far is the cliff from the boy? a)

480\,\text{m}

204\,\text{m}

408\,\text{m}

816\,\text{m}