Q.

The mean free path of molecules of a gas, (radius r) is inversely proportional to

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a

r3

b

r2

c

r

d

r

answer is B.

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Detailed Solution

Mean free path, λ=12nπd2where n is the number density and d is the diameter of the molecule.As d = 2r∴  λ=142nπr2   or   λ∝1r2
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