Question: 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

A source of unknown frequency gives 4 beats/s, when sounded with a

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 (c) 260 Hz (b) 240 Hz (d) 254 Hz

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