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
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Let be frequency of the unknown source. As it gives 4 beats per second when sounded with a source of frequency 250 Hz,
Hz or 254 Hz
Second harmonic of this unknown source 
Hz or 508 Hz which gives 5 beats per second, when sounded with a source of frequency 513 Hz. Therefore, unknown frequency, 
Hz.
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