A source of unknown frequency gives 4 beats \( / \mathrm{s} \), whe...

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A source of unknown frequency gives 4 beats \( / \mathrm{s} \), when sounded with a source of known frequency \( 250 \mathrm{~Hz} \), The
\( \mathrm{P} \) second harmonic of the source of unknown frequency gives

W five beats per second, when sounded with a source of frequency \( 513 \mathrm{~Hz} \), The unknown frequency is [NEET 2013]
(a) \( 260 \mathrm{~Hz} \)
(b) \( 254 \mathrm{~Hz} \)
(c) \( 246 \mathrm{~Hz} \)
(d) \( 240 \mathrm{~Hz} \)
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