The internal energy of a monoatomic ideal gas molecule is (a) partly kinetic and partly potential (b) totally kinetic (c) totally potential (d) Neither kinetic nor potential

Answer: (b). An ideal gas has no intermolecular forces, so there is no potential energy between molecules. A monoatomic molecule has only translational kinetic energy 3/2kT. So the answer is (b) totally kinetic.

The internal energy of a monoatomic ideal gas molecule is | MHT CET 2023 (13 May, Shift 2)

Q17MHT CET 2023 · 13 MAY · SHIFT 2Easy

Degrees of Freedom & Internal Energy

The internal energy of a monoatomic ideal gas molecule is

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Answer: (b)

An ideal gas has no intermolecular forces, so there is no potential energy between molecules.
A monoatomic molecule has only translational kinetic energy $\frac{3}{2}kT$ .
So the answer is (b) totally kinetic.

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