Question

Frequency of a sound wave if it travels with a speed of 330 ms${}^{-1}$ in air and the wavelength of the wave is 330 cm is :

• A. 100 Hz
• B. 200 Hz
• C. 150 Hz
• D. none of the above
  

Answer 1

Answer: (A)

100 Hz

We have , a relation in frequency $f$ and wavelength $\lambda$ of a wave having the velocity $v$ as ,

$v=f\lambda$ ,

or $f=v/\lambda$

Given $v=330m/s$ , $\lambda =330cm=3.3m$ ,

Therefore velocity of wave, $f=330/3.3=100Hz$