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JEE Main 2023 · PhysicsMultiple choiceSingle correctEasyApplication

JEE Main 6 April 2023, Shift 1, Physics Q45

Question 45 of 90 in this shift, Physics question 15 of 30, Section A.

The number of air molecules per

\mathrm{cm^3}

increased from

3\times10^{19}

to

12\times10^{19}

. The ratio of collision frequency of air molecules before and after the increase in number respectively is :

(1)0.25Official answer
(2)0.50
(3)0.75
(4)1.25

Official answer

Option 1

NTA final key.

Chapter: Kinetic Theory
Topic: Kinetic Theory of Gases
Idea tested: Collision Frequency

Same idea in other shifts

Asked 2× in all

5 Apr 2024, Shift 1 · Q39If the collision frequency of hydrogen molecules in a closed chamber at $27^\circ\mathrm{C}$ is $Z$ , then the collision frequency of the…EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.