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A source of unknown frequency gives 4 be...

A source of unknown frequency gives 4 beats//s, 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

A

246 Hz

B

240 Hz

C

260 Hz

D

245 Hz

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The correct Answer is:
D
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