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

1. 1 / √2πnd²
2. 1 / √2π²nd²
3. 1 / √2π²d²
4. 1 / √2nd

Correct answer: 1 / √2πnd²

Solution

The mean free path (λ) is derived using the kinetic theory of gases and is given by λ = 1 / (√2πnd²), where n is the number density and d is the molecular diameter.

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