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Sound signal is sent through a composite...

Sound signal is sent through a composite tube as shown in the figure. The radius if the semicircular portion of the tube `r`. Speed of sound in air is `v`. The source of sound is capable of giving vaied frequencies in the range of `v_(1)` and `v_(2)` (where `v_(2) gt v_(1)`). If `n` is an integer then frequency for maximum intensity is given by

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