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Degrees of freedom for monatomic gas (e.g., He, Ar):
A6
B3 (only translation: x, y, z)
C1
D5
Answer & Solution
Correct answer: B. 3 (only translation: x, y, z)
Monatomic: only translational motion (3 DOF). Internal energy U = (3/2) nRT. γ = C_p/C_v = 5/3.
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