For a monatomic gas, one measure of the average speed of the atoms is the root mean
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For a monatomic gas, one measure of the “average speed” of the atoms is the root mean square speed, v rms = (v2)1/2 = √3kBT/m, in which m is the molecular mass and kB is the Boltzmann constant. Using this formula, calculate the de Broglie wavelength for H2 and Ar at 200. and at 900. K.
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