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At T = 14 ∘C, how long must an open organ pipe be to have a fundamental frequency of 349 Hz ? The speed of sound in air is v≈(331+0.60T)m/s, where T is the temperature in ∘C. If this pipe is filled with helium at 20∘C and 1 atm, what is its fundamental frequency? The speed of sound in helium is 1005 m/s

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