A tuning fork of unknown frequency produces 4 beats per second when...

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A tuning fork of unknown frequency produces 4 beats per second when sounded with another tuning
\( \mathrm{P} \) fork of frequency \( 254 \mathrm{~Hz} \). It gives the same number

W of beats per second when unknown tuning fork loaded with wax. The unknown frequency before loading with wax is
(1) 258
(2) 254
(3) 250
(4) Can't be determined
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