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A tuning fork arrangement (pair) produces 4 beats s^–1 with one fork of frequency 288 cps. A little wax is placed on the unknown

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A tuning fork arrangement (pair) produces 4 beats s–1 with one fork of frequency 288 cps. A little wax is placed on the unknown fork and it then produces 2 beats s–1. What is the frequency of the unknown fork ?

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Unknown freq. = Known freq. I Beat freq. 

= 288 ± 4 = 292 or 284 Hz

On putting wax, freq. decreases, beat freq. is also decrease to 2 

∴ unknown freq. = 292 Hz (higher one)

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