alleryThe **mean free path** of a gas molecule is:
AThe total distance travelled in 1 second
BThe average distance between two successive collisions
CThe diameter of the molecule
DThe size of the container
Answer & Solution
Correct answer: B. The average distance between two successive collisions
Mean free path λ = average distance a molecule travels between successive collisions.
$\lambda = 1/(\sqrt 2 \pi d^2 \cdot N/V)$ for molecular diameter $d$ and number density $N/V$.
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