If P is doubled at constant T (compress gas isothermally), the mean free path:
ADoubles
BHalves (λ ∝ 1/N/V ∝ T/P)
CQuadruples
DStays same
Answer & Solution
Correct answer: B. Halves (λ ∝ 1/N/V ∝ T/P)
$\lambda = k_B T /(\sqrt 2 \pi d^2 P)$ ⇒ $\lambda \propto T/P$ (at fixed $d$). Doubling $P$ halves λ.
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