1.

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 ofunknown frequency gives five beats per second when sounded with a source of frequency 513Hz. The unknown frequency is (a) 254 Hz (b) 246 Hz (c) 240 Hz (d) 260 H

Answer» 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 ofunknown frequency gives five beats per second when sounded with a source of frequency 513Hz. The unknown frequency is (a) 254 Hz (b) 246 Hz (c) 240 Hz (d) 260 H


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