MHT CET Physics question
A source of unknown frequency gives 4 beats when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second when sounded with a source of frequency 513 Hz. The unknown frequency is [MHTCET 2013]
Answer: (A)
Solution
The unknown frequency is 246 or 254 Hz, so its second harmonic is 492 or 508 Hz; with 513 Hz the beats are 21 or 5, so
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