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MHT CET Physics question

PhysicsWavesMHT CET

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: (A)

Solution

The first condition gives 254 Hz or 246 Hz; the second harmonic must be 508 Hz or 518 Hz, i.e. Hz or 259 Hz, so 254 Hz satisfies

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Question ID VK-070177