QuestionGaseous state / mean free path
The average velocity of a gas molecule of O₂ at 25°C and 1 bar is 400 m s⁻¹ and its collision frequency is 2·0 × 10⁹ s⁻¹. The mean free path and the average time between collisions are respectively
- (a) 500 nm and 1·25 × 10⁻⁵ s
- (b) 200 nm and 5·0 × 10⁻¹⁰ s
- (c) 50 nm and 2·0 × 10¹⁰ s
- (d) 200 nm and 5·0 × 10¹⁰ s
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