Question

Find the frequency of tuning fork.
Assume velocity of sound in the first and second chamber be 1100 m/s and 300 m/s respectively. Velocity of sound in air 330 m/s.

Answer 1

Since the tuning fork is in resonance with the air column and traveling with a finite speed, the Doppler Effect needs to be accounted.

Thus $1650=f\left(\frac{c}{c-v}\right)=f\frac{330}{300}$

$⟹f=1500Hz$