Question

The frequency of sound waves is $11kHz$ and its wavelength is $20cm$, then the velocity of sound waves is ______.

• A. $220{ms}^{-1}$
• B. $220cm{s}^{-1}$
• C. $2200cm{s}^{-1}$
• D. $2200{ms}^{-1}$

Answer 1

The correct option is D $2200{ms}^{-1}$

Given,

Frequency, $f=11\times {10}^{3}Hz$

Wavelength, $\lambda =20cm=0.2m$

Velocity of sound wave, $v$

We know,

$v=f\times \lambda$

$v=11\times {10}^3\times 0.2$

$v=2200m/s$