Q20 of 36 Page 109

A tuning fork A, marked 512 Hz, produces 5 beats per second, where sounded with another unmarked tuning fork B. If B is loaded with wax the number of beats is again 5 per second. What is the frequency of the tuning fork B when not loaded?

Frequency of tuning fork A:


Tuning fork, A produces 5 beats per second.


When tuning fork B is loaded with wax, then also it produces 5 beatssecond.


Now, the frequency of tuning fork B may be:



= 512 5


= 517 Hz or 507 Hz


If the frequency of tuning fork B is 517 Hz, it will reduce to 507 Hz making 5 beatssecond and if the frequency of tuning fork B is 507 Hz, it will increase to 517 Hz again making 5 beatssecond.


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