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A cylindrical tube, open at both ends, has a fundamental frequency v. The tue is dipped vertically in water so that half of its length is inside the water. The new fundamental frequency is

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In figure (i)

`(lamda)/(2)=1implies lamda=21`
`f=(c)/(lamda)=(c)/(21)`
In figure (ii),
`(lamda')/(2)=(1)/(2)implies'=21`
From figure (ii) and (i), `f'=(c)/(lamda')=(c)/(21)=f`
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