At what frequency would the wavelength of sound in air be equal to the mean free path

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At what frequency would the wavelength of sound in air be equal to the mean free path of oxygen molecules at 1.0 atm pressure and 0.00oC? Take the diameter of an oxygen molecule to be 3.0 x 10-8 cm.

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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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