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NEET2020PhysicsKinetic Theory of GasesActual

The mean free path l for a gas molecule depends upon diameter, d of the molecule as:

Options

  1. Al ∝ 1 d 2
  2. Bl ∝ d
  3. Cl ∝ d 2
  4. Dl ∝ 1 d

Correct answer

A. l ∝ 1 d 2

Step-by-step solution

The mean free path is an average distance over which a moving particle substantially changes its direction or energy, typically as a result of one or more successive collisions with other particles. The mean free path for a gas molecule depends upon the diameter, d of the molecule as: λ = 1 2 π d 2 n ∝ 1 d 2 , λ = the mean free path d = the effective diameter of the molecule n = the number density of molecules

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