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Question: 550 hz sound is emitted from a megaphone into symmetrical...

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550 Hz sound is emitted from a megaphone into symmetrical tubes of one top path and one bottom path. The top and bottom paths are initially identical, but the top path can be lengthened. a. Why is the interference initially constructive? b. How far do you have to raise the top part of the tube to achieve destructive interference in m?  

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