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An open organ pipe is vibrating in its f...

An open organ pipe is vibrating in its fifth overtone. The distance between two consecutive pionts where pressure amlitude is `1/sqrt 2` times pressure amplitude at pressure antinodes,is 40 cm , then the length of open organ pipe is ( neglect end connection )

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The correct Answer is:
5
`(lamda)/2=40cmimplieslamda=0.8m`
`l=(6lamda)/2=21.4mt=12/5m`
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