Number of degrees of freedom (DOF) of a monatomic gas (e.g. helium) molecule:
A1
B2
C3 (translational only)
D5
Answer & Solution
Correct answer: C. 3 (translational only)
Monatomic: 3 translational DOF only. No rotation contributes (a point mass has zero moment of inertia), no vibrations (single atom). Internal energy per mole = (3/2)RT.
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