An ultrasound wave in air has frequency and wavelength

PHYSICS · Single correct · A Level · Physics · Waves · Waves

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}

(b)

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

(c)

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

(d)

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