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PhysicsJEE Main 28 Jan 2026, Shift 2·Q4·MCQ·Easy–moderate

Kinetic Theory of Gases · Kinetic theory of an ideal gas

The mean free path of a molecule of diameter 5×10−105\times10^{-10} m at the temperature 41∘41^\circC and pressure 1.38×1051.38\times10^{5} Pa, is given as m. (Given kB=1.38×10−23k_B = 1.38\times10^{-23} J/K).
  1. (1)22×10−102\sqrt2\times10^{-10}
  2. (2)102×10−810\sqrt2\times10^{-8}
  3. (3)22×10−82\sqrt2\times10^{-8}
  4. (4)2×10−82\times10^{-8}

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