Question: Using the root mean square speed, v rms = (v 2 ) 1/2 = 3k B T/m, calculate the gas temperatures of He and Ar

Using the root mean square speed, v _rms = (v²)^1/2 = √3k_BT/m, calculate the gas temperatures of He and Ar for which λ = 0.25 nm, a typical value needed to resolve diffraction from the surface of a metal crystal. On the basis of your result, explain why Xe atomic beams are not suitable for atomic diffraction experiments.

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