Question

A sound is travelling in air at a speed of $343m{s}^{-1}$. The wavelength of the sound wave is $0.1cm$. Find the frequency of the sound wave.

• A. $543000Hz$
• B. $343000Hz$
• C. $400000Hz$
• D. $633000Hz$

Answer 1

The correct option is B $343000Hz$

Given:
Speed of the sound, $v=343m{s}^{-1}$
Wavelength, $\lambda =0.1cm=0.001m$

Let frequency be $f$.
Speed of the wave is given as the product of frequency and wavelength.
$v=f\lambda$
$⟹f=\frac{343m{s}^{-1}}{0.001m}$
$f=343000Hz$

Frequency of the sound wave is $343000Hz$.