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Q.

A cylindrical tube open at both ends has fundamental frequency f in air. The tube is dipped vertically in water, so that half of it is in water. The fundamental frequency of air column is now

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a

$f / 2$

b

$3 f / 4$

c

$2 f$

d

$f$

answer is A.

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Detailed Solution

$f = \frac{v}{2 L}$
$f^{/} = \frac{v}{4 (\frac{L}{2})} = f$

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