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What is meant by end correction in reson...

What is meant by end correction in resonance air column apparatus?

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The antinodes are not exactly formed at the open end, we have to include a correction, called end correction e, by assuming that the antinode is formed at some small distance above the open end. Including this end correction, the first resonance is
`(1)/(4) lambda = L_(1) + e`
Again taking end correction into account , we have
`(3)/(4) lambda = L_2 + e`
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