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PhysicsNEET 2020Mean free path

Kinetic Theory

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

  1. A.12 nπd\dfrac{1}{\sqrt2\,n\pi d}
  2. B.12 nπd2\dfrac{1}{\sqrt2\,n\pi d^2}✓
  3. C.12 n2πd2\dfrac{1}{\sqrt2\,n^2\pi d^2}
  4. D.12 n2π2d2\dfrac{1}{\sqrt2\,n^2\pi^2 d^2}

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