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  4. A source of unknown frequency gives 4 beat/s when sounded with a source of unknown frequency 250 Hz. The second harmonic of the source of unknown frequency gives 5 beats per sec when sounded with a source of frequency 513 Hz. The unknown frequency is

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Q. A source of unknown frequency gives 4 beat/s when sounded with a source of unknown frequency $250 Hz$. The second harmonic of the source of unknown frequency gives 5 beats per sec when sounded with a source of frequency $513 Hz$. The unknown frequency is

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Solution:

Correct answer is (a) 254

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