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Question 31007
JEE Physics · Medium

Kinetic Theory and Thermodynamics: Speeds MCQ

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SpeedsMediumQuestion 31007

Question

The correct order of molecular speeds in a gas is:
  1. A
    v_mp < v_avg < v_rms
    Correct
  2. B
    v_rms < v_avg < v_mp
  3. C
    v_avg < v_mp < v_rms
  4. D
    v_mp < v_rms < v_avg

Correct answer

v_mp < v_avg < v_rms

Explanation

v_mp = √(2RT/M), v_avg = √(8RT/πM), v_rms = √(3RT/M). Numerically: 1 : 1.128 : 1.225. Always v_mp < v_avg < v_rms.

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