JEE Main 2021PhysicsKinetic Theory of GasesEasyMCQ

JEE Main 2021 — Kinetic Theory of Gases Question with Solution

JEE Main 2021 (16 Mar Shift 2)

Question

Calculate the value of the mean free path λ for oxygen molecules at temperature 27°C and pressure 1.01×105 Pa. Assume the molecular diameter 0.3 nm and the gas is ideal. k=1.38×10-23 J K-1

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Show full solutionCorrect option: D
Correct answer
D102 nm

Step-by-step explanation

λ=RT2πd2 NAP

λ=8.314×3002×3.14×0.3×10-92×6.023×1023×1.01×105

λ=102 nm

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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.