Question

The frequency of a sound wave is 20Hz. Find its time period. If the velocity of sound in air is 330 m/s, find its wavelength.

Answer 1

Frequency = 20 Hz
We know that,
frequency=$\frac{1}{timeperiod}$
time period=$\frac{1}{frequency}$
time period =$\frac{1}{20}$
time period = 0.05 seconds
Velocity = frequency $\times$ wavelength
$330=20\times wavelength$
wavelength = $\frac{330}{20}$
wavelength = 16.5 m
So, the wavelength is 16.5 metres.