Assertion :According to the law of equipartition of energy, internal energy of an ideal gas at a given temperature, is equally distributed in translational and rotational kinetic energies. Reason: Rotational kinetic energy of a monoatomic gas is zero.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
Rotational KE of monatomic gas is zero since there is no axis about which the gas can atom can rotate.
According to the law of equipartition of energy, internal energy of an ideal gas at a given temperature, is equally distributed among translational and rotational degrees of freedom.
Energy per degree of freedom is $\frac{1}{2} k T$

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