Consider two ideal diatomic gases A and B at some temperature T. Molecules of the gas A are rigid, and have a mass m. Molecules of the gas B have an additional vibrational mode, and have a mass . The ratio of the specific heats of gas A and B, respectively is :

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7 : 9

5 : 7

3: 5

5 : 9

answer is B.

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Detailed Solution

Degree of freedom of a diatomic moleculeif vibration is absent = 5Degree of freedom of a diatomic moleculeif vibration is present = 7

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