MHT CET Physics question
A source of sound gives 5 beats when sounded with another source of frequency 100 Hz. The second harmonic of the source together with a source of frequency 205 Hz gives 5 beats . What is the frequency of the source?
Answer: (A)
Solution
The source is 105 or 95 Hz, so its second harmonic is 210 or 190 Hz, which gives 5 beats with 205 Hz only for 210 Hz, hence
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