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A source of unknown frequency gives 4 beats per second when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency givese 5 beats per second when sounded with a source of frequency 513 Hz. The unknown frequency is 1)240hz 2)260hz 3)254hz 4)246hz?
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A source of unknown frequency gives 4 beats per second when sounded wi...
Let the unknown frequency be f.

Beats are the difference in frequencies.

4= (250 -f)
5= (250-2f) second harmonic

Only f=254 satisfied the above condition.

Hence option 3 is the correct.
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A source of unknown frequency gives 4 beats per second when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency givese 5 beats per second when sounded with a source of frequency 513 Hz. The unknown frequency is 1)240hz 2)260hz 3)254hz 4)246hz?
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