A cylindrical tube, open at both ends, has a fundamental frequency ...

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A cylindrical tube, open at both ends, has a fundamental frequency \( (f) \) in air. The tube is dipped vertically in water
\( \mathrm{P} \) so that half of it is in water. The fundamental frequency of

W the air-column is now
[WB-JEE 2008; AIEEE 2012; JEE Main 2016]
(a) \( f \)
(b) \( f / 2 \)
(c) \( 3 f / 4 \)
(d) \( 2 f \)
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