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Question 31057
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Kinetic Theory and Thermodynamics: Specific Heat MCQ

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Specific HeatHardQuestion 31057

Question

Why Cv of monatomic gas (3R/2) is less than diatomic (5R/2)?
  1. A
    Monatomic molecules are heavier
  2. B
    Diatomic has extra rotational energy storage modes
    Correct
  3. C
    Pressure is higher for diatomic
  4. D
    Monatomic atoms vibrate more

Correct answer

Diatomic has extra rotational energy storage modes

Explanation

Monatomic: 3 translational DOF → Cv = 3R/2. Diatomic: 3 translational + 2 rotational DOF → Cv = 5R/2. More modes = larger Cv.

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