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Which order of harmonics is missing or a...

Which order of harmonics is missing or absent in case of stationary sound waves produced in a closed pipe ?

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Even order of harmonics is missing or absent. (In case of closed pipe, possible harmonics are `f_(1) , 3f_(1) , 5f_(1) , 7f_(1) …` where `f _(1) = (v)/(4L))`
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