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Transport Phenomena

Problem 2.226

An acoustic wave propagates through nitrogen under standard conditions. At what frequency will the wavelength be equal to the mean free path of the gas molecules?

Reveal Answer
v=πd2p0NA2γ/MRT0=5.5GHzv=\pi d^{2} p_{0} N_{A} \sqrt{2 \gamma / M R T_{0}}=5.5 \mathrm{GHz}
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