⚛️ Physics · Thermodynamics · NEET & JEE

For a diatomic ideal gas (rigid molecules) with Cv = 5R/2, the ratio γ = Cp/Cv is:

Answer: 1.4.

A 1
B 1.33
C 1.4
D 1.67

Correct answer: C. 1.4

Explanation: Cp = Cv + R = 7R/2, so γ = (7R/2)/(5R/2) = 7/5 = 1.4.

The Carnot cycle alternates two isothermal steps (heat absorbed at T_H, released at T_C) with two adiabatic steps (no heat exchange); the enclosed loop area equals the net work output, and η = 1−T_C/T_H is the maximum possible efficiency between those two temperatures.

Concept context

Laws of thermodynamics, heat engines, entropy, and gas processes.

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For a diatomic ideal gas (rigid molecules) with Cv = 5R/2, the ratio γ = Cp/Cv is:

Concept context

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