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.

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

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

Both Assertion and Reason are incorrect.

Assertion is correct but Reason is incorrect.

answer is B.

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Detailed 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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