Physics

Problem

An ultrasound wave in air has frequency

40\,\text{kHz}

and wavelength

0.85\,\text{cm}

. Calculate its speed. a)

3.4\times10^{3}\,\text{m s}^{-1}

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

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

3.4\times10^{4}\,\text{m s}^{-1}