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In a resonance tube, using a tuning fork...

In a resonance tube, using a tuning fork of frequency 325 Hz, two successive resonance lengths are observed at 25.4 m and 77.4 cm respectively. The velocity of sound is air is

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The correct Answer is:
`v=2 xx 325 (77.4-25.4) xx 10^(-2) =338 ms^(-1), e=(l_(2)-3t_(1))//2=0.6cm`
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