Two tuning forks A and B produce 8 beats/ s when sounded together. A gas column \( 37.5 \) \( \m...

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Two tuning forks A and B produce 8 beats/ s when sounded together. A gas column \( 37.5 \)
\( \mathrm{P} \) \( \mathrm{cm} \) long in a pipe closed at one end resonate

W to its fundamental mode with fork A whereas a column of length \( 38.5 \mathrm{~cm} \) of the same gas in a similar pipe is required for resonance with fork B. The frequencies of these two tuning forks, are:-
(1) \( 308 \mathrm{~Hz}, 300 \mathrm{~Hz} \)
(2) \( 208 \mathrm{~Hz}, 200 \mathrm{~Hz} \)
(3) \( 300 \mathrm{~Hz}, 400 \mathrm{~Hz} \)
(4) \( 350 \mathrm{~Hz}, 500 \mathrm{~Hz} \)
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