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GR0877 Problem 77

PROBLEM STATEMENT: This problem is still being typed.

SOLUTION: (C) The average time between intermolecular collisions is $\tau = l/v = 1/(\sigma nv)$, where $l$ is the mean free path, $\displaystyle v = \sqrt{\frac{3kT}{m}}$ is the root mean square speed, $\sigma$ is the molecule’s effective collision area. Thus, the time varies as the square root of $m$.

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