A tuning fork arrangement (pair) produces `4 beats//sec` with one fork of frequency `288cps`. A little wax is placed on the unkn

A tuning fork arrangement (pair) produces `4 beats//sec` with one fork of frequency `288cps`. A little wax is placed on the unknown fork and it then produces `2 beats//sec`. The frequency of the unknown fork is
A. 286 cps
B. 292 cps
C. 294 cps
D. 288 cps

A tuning fork arrangement (pair) produces `4 beats//sec` with one fork of frequency `288cps`. A little wax is placed on the unknown fork and it then p

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