Question

A sound source sends waves of 400 Hz. In a medium, this sound has a wavelength of 2.5 m. Find the speed of sound waves in the medium.

• A. $100m{s}^{-1}$
• B. $1000m{s}^{-1}$
• C. $10000m{s}^{-1}$
• D. $3000m{s}^{-1}$

Answer 1

The correct option is B $1000m{s}^{-1}$

Given:
Wavelength, $\lambda =2.5m$
Frequency, $f=400Hz$.

Let wave speed be $v$.
Speed of sound is given by:
$v=f\lambda$.
$v=400\times 2.5=1000m{s}^{-1}$.

Therefore, speed of sound wave is $1000m{s}^{-1}$.