Question

A sound wave having a wavelength of 20 cm is travelling in water. If the velocity of sound in water is $1600m{s}^{-1}$ then, find the frequency of the sound wave.

• A. 9000 Hz
• B. 8000 Hz
• C. 7000 Hz
• D. 1600 Hz

Answer 1

The correct option is B

8000 Hz

Given, speed of wave, $v=1600m{s}^{-1}$
Wavelength, $\lambda =20cm=0.2m$
Speed of wave is the product of frequency and Wavelength.
$v=f\lambda$
$\Rightarrow f=\frac{1600}{0.2}=8000\text{Hz}$
Therefore, the frequency of sound wave is $8000\text{Hz}$.