JEE Main 2020PhysicsKinetic Theory of GasesMediumMCQ

JEE Main 2020 — Kinetic Theory of Gases Question with Solution

JEE Main 2020 (09 Jan Shift 2)

Question

Two gases - argon (atomic radius 0.07nm, atomic weight 40 ) and xenon (atomic radius 0.1nm, atomic weight 140 ) have the same number density and are at the same temperature. The ratio of their respective mean free times is closest to:

Choose an option

Show full solutionCorrect option: B
Correct answer
B1.83

Step-by-step explanation

Mean free time =12nπd2vrms
tArtXe=dXe2dAr2×m1m2
=0.10.072×40140
=1072×27=1.09
closest value is 1.83

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About this question

This is a previous-year question from JEE Main 2020, covering the Kinetic Theory of Gases chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.