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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2013
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Q)

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 ) 240 Hz
( B ) 260 Hz
( C ) 254 Hz
( D ) 246 Hz

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