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At T = 22 ∘C, how long must an open organ pipe be to have a...

At T = 22 ∘C, how long must an open organ pipe be to have a fundamental frequency of 392 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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Answer #1

Here,

Fundamental frequency of open organ pipe is,

f= v/2L

Then,

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