A source of unknown frequency gives 4 beats/s when sounded with a source of known frequency \( 2...

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PW Solutions
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Frequency (2001)
Duration: 3:58
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A source of unknown frequency gives 4 beats/s when sounded with a source of known frequency \( 250 \mathrm{~Hz} \). The second harmonic of the source of unknown frequency gives 5 beats/s when sounded with a source of frequency \( 513 \mathrm{~Hz} \). The unknown frequency is
(a) \( 254 \mathrm{~Hz} \)
(b) \( 246 \mathrm{~Hz} \)
(c) \( 240 \mathrm{~Hz} \)
(d) \( 260 \mathrm{~Hz} \)
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