The ratio of frequencies of two pendulums are \( 2: 3 \), then thei...

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The ratio of frequencies of two pendulums are \( 2: 3 \), then their lengths are in ratio
(a) \( \sqrt{2 / 3} \)
(b) \( \sqrt{3 / 2} \)
(c) \( 4 / 9 \)
(d) \( 9 / 4 \)
\( \mathrm{P} \)
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