A tuning fork A of frequency 512 Hz produces 5 beats per second when sounded with another tuning fork B of unknown frequency. If B is loaded with wax the number of beats is again 5 per second. The frequency of the tuning fork B before it was loaded is
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Given that, 
On loading, frequencies of B decreased
So, in the first case 
When B is loaded, the frequency of B becomes,
We can write it as,
On load in the frequency of 
decreased by 507 to lower value of the number of beats will increase so 
If 
then its frequency decreases by 10 Hz by then the number of beats will also be the same as 
.
Thus, the frequency of the tuning fork B when not loaded is 517 Hz .
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