MHT CET Physics question
A fork of unknown frequency gives four beats when sounded with another of frequency 256. The fork is now loaded with a piece of wax and again four beats are heard. Then the frequency of the unknown fork is
Answer: (D)
Solution
The fork is 252 or 260 Hz; loading with wax lowers its frequency, so a fork at 252 Hz would give more than 4 beats, whereas a fork at 260 Hz
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