⚛️ Physics · Thermodynamics · NEET & JEE

For a gas expanding adiabatically, gamma = Cp/Cv = 5/3. If pressure halves, volume changes by factor:

Answer: 2^5/3.

A 2
B 2^3/5
C 2^5/3
D 3/5

Correct answer: C. 2^5/3

Explanation: PV^gamma = constant. P₁ V₁^5/3 = P₂ V₂^5/3. V₂^5/3 = (P₁/P₂) V₁^5/3 = 2 V₁^5/3. V₂ = 2^3/5 V₁. Answer: 2^3/5.

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 gas expanding adiabatically, gamma = Cp/Cv = 5/3. If pressure halves, volume changes by factor:

Concept context

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