Question

A Tuning fork of frequency 300HZ resonates with an air column closed at one end at 27⁰C. How many beats will be heard in the vibration of the fork and the air column at 0⁰C? 

Answer 1

According to the question, Frequency of air column at 27⁰C is 300 HZ 

Let l = length of air column and speed of sound = V₂₇  

For a pipe; closed at one end, the frequency of n^th harmonic is:→

The frequency of tuning fork remains 300HZ Number of beats = f₁ – f₂ 

= 300-286     = 14 Per second