JEE Main 2021PhysicsKinetic Theory of GasesMediumNumerical

JEE Main 2021 — Kinetic Theory of Gases Question with Solution

JEE Main 2021 (25 Jul Shift 2)

Question

A system consists of two types of gas molecules A and B having the same number density 2×1025 m-3. The diameter of A and B are 10A and 5A respectively. They suffer collisions at room temperature. The ratio of average distance covered by the molecule A to that of B between two successive collisions is ___________×10-2

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Show full solutionCorrect answer: 25
Correct answer
25

Step-by-step explanation

∵ Mean free path

λ=12πd2n

λ1λ2=d22n2 d12n1

=5102=0.25=25×10-2

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About this question

This is a previous-year question from JEE Main 2021, 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.