Two tuning forks, \( A \) and \( B \), produce notes of frequencies \( 258 \mathrm{~Hz} \) and \....

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Two tuning forks, \( A \) and \( B \), produce notes of
\( \mathrm{P} \)
frequencies \( 258 \mathrm{~Hz} \) and \( 262 \mathrm{~Hz} \). An unknown note sounded with A produces certain beats. When the same note is sounded with \( B \), the beat frequency gets doubled. The unknown frequency is
(1) \( 250 \mathrm{~Hz} \)
(2) \( 252 \mathrm{~Hz} \)
(3) \( 254 \mathrm{~Hz} \)
(4) \( 256 \mathrm{~Hz} \)


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