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  4. A source of unknown frequency gives 4 beat'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

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Q. A source of unknown frequency gives $4\, beat's$, 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

NEETNEET 2013Waves

Solution:

Frequency of unknown source = 246 Hz or 254Hz
Second harmonic of this source = 492Hz or 508 Hz
Which gives 5 beats per second, when sounded with a source of frequency 513 Hz. Therefore unknown frequency = 254 Hz