MHT CET 2023 Physics question

For polyatomic gases, the ratio of molar specific heat at constant pressure to constant volume is (f = degree of freedom)

(A)
(B)
(C)
(D)Correct

Answer: (D)

Solution

For a non-linear polyatomic molecule there are 3 translational and 3 rotational degrees of freedom, contributing to , and each vibrational mode contributes (kinetic plus potential energy). With vibrational modes, and by Mayer's relation . Hence $γ =

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Question ID VK-097221