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Question 30887
JEE Physics · Hard

Elasticity, Thermal Expansion, Calorimetry and Heat Transfer: Conduction Advanced MCQ

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Conduction AdvancedHardQuestion 30887

Question

Thermal conductivity of a gas is independent of pressure because:
  1. A
    Collisions increase proportionally to number density
  2. B
    Mean free path decreases but number density increases — effects cancel
    Correct
  3. C
    Gas molecules don't conduct heat
  4. D
    Pressure does not affect kinetic energy

Correct answer

Mean free path decreases but number density increases — effects cancel

Explanation

k ∝ n × λ × v_avg. As P increases, n ∝ P and λ ∝ 1/P. Product n×λ = constant, so k is independent of pressure.

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