Question:
The number of rotational degrees of freedom of a diatomic molecule is
The number of rotational degrees of freedom of a diatomic molecule is
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Monatomic gases have 0, diatomic gases have 2, and non-linear polyatomic gases have 3 rotational degrees of freedom.
Updated On: May 12, 2025
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The Correct Option is D
Solution and Explanation
A diatomic molecule can rotate about two perpendicular axes passing through the center of mass and perpendicular to the internuclear axis.
It cannot rotate about the internuclear axis as the moment of inertia is very small (negligible).
Hence, diatomic molecules have 2 rotational degrees of freedom.
It cannot rotate about the internuclear axis as the moment of inertia is very small (negligible).
Hence, diatomic molecules have 2 rotational degrees of freedom.
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