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NEET 2020 (Phase 1) · Mean Free Path & Real Gases

Mean Free Path & Real Gases question from NEET 2020 (Phase 1)

Q17NEET 2020 · PHASE 1Easy

Mean Free Path & Real Gases

The mean free path for a gas, with molecular diameter d and number density n can be expressed as:

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Answer: (a)

A molecule of diameter $d$ sweeps a collision cross-section $\pi d^2$ ; including relative motion of other molecules gives a factor $\sqrt{2}$ .
$\lambda = \dfrac{1}{\sqrt{2}\,n\pi d^2}$
So the answer is (a).

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