Physics

Problem

An observer stands

150\,\text{m}

in front of a tall building. How long after he shouts will he hear the echo if the speed of sound in air is

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

? a)

0.45\,\text{s}

1.80\,\text{s}

0.90\,\text{s}

0.23\,\text{s}