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What is the approximate mean free path of air molecules at STP?
A2.9 × 10^-7 m
B2.9 × 10^-10 m
C2.9 × 10^-4 m
D2.9 × 10^-2 m
Answer & Solution
Correct answer: A. 2.9 × 10^-7 m
With n = 2.7 × 10^25 per m³ and d = 2 × 10^-10 m, the mean free path comes to about 2.9 × 10^-7 m.
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