First slide

Law of equipartition of energy

Question

Assertion : Vibrational degree of freedom of a diatomic gas molecule appears at every high temperature.
Reason : Diatomic gas has two vibrational degree of freedom in one direction. [AIIMS 2019]

Moderate

A

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
B

Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
C

Assertion is correct but Reason is incorrect.
D

Both Assertion and Reason are incorrect.

Solution

There are two vibrational degree of freedom of diatomic gas molecules at high temperature , one is kinetic mode and the other is potential mode. At low temperature the atoms of a diatomic gas are assumed to be connected to each other by a massless rigid rod, at high temperature this rod behaves like a spring and the atoms start vibrating .

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