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NEET 2013 Physics question

PhysicsWavesNEET 2013

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 -

Answer: (1)

Solution

With 4 beats/s against 250 Hz, the unknown frequency is Hz or 246 Hz. Its second harmonic is then Hz or 492 Hz. The second harmonic gives 5 beats/s with 513 Hz, so $2ν = 513 ± 5 =

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Question ID VK-091316