A) inversely proportional to number of molecules per unit volume
B) inversely proportional to diameter of the molecule
C) directly proportional to the square root of the absolute temperature
D) directly proportional to the molecular mass
E) independent of temperature
Correct Answer: A
Solution :
Mean free path\[\lambda =\frac{1}{\sqrt{2}\pi n{{d}^{2}}}\] where,\[n=\]number of molecules/unit volume \[d=\]diameter of the molecule. Hence, mean free path of a gas molecule is inversely proportional to number of molecules per unit volume.
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