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What is specific heat a function of at high temperatures?

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What is specific heat a function of at high temperatures?

(a) Time

(b) Temperature

(c) Entropy

(d) Density

The question was asked in an online quiz.

My doubt is from Microscopic Description of Gases in chapter Properties of High Temperature Gases of Aerodynamics

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Right option is (b) Temperature

Explanation: The vibrational motion of the molecules becomes significant by absorbing some of the energy that would otherwise go into the translational and rotational molecular motion as the temperature of a diatomic or polyatomic gas is raised above normal conditions. The excitation of vibrational energy, allows the specific heat to become a function of temperature function making it thermally perfect rather than calorically perfect.

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