Q 11-14-021NEETJEE MainTop questionEasy
A tuning fork of frequency $256$ Hz produces $4$ beats per second with another fork. When the second fork is loaded with a little wax, the beat frequency decreases. The original frequency of the second fork was
Answer: (A) $260$ Hz
The second fork is $256 \pm 4$ Hz. Wax lowers its frequency. If it were $252$ Hz, lowering it would increase the beats. Since the beats decrease, it must have been $260$ Hz.
Solution by Sreeraj P, M.Sc Physics