Answer: 5R/2.
- A R/2
- B 3R/2
- C 5R/2
- D 7R/2
Correct answer: C. 5R/2
Explanation: Monatomic: Cv = 3R/2. Cp = Cv + R = 3R/2 + R = 5R/2.
The Carnot cycle alternates two isothermal steps (heat absorbed at TH, released at TC) with two adiabatic steps (no heat exchange); the enclosed loop area equals the net work output, and η = 1−TC/TH is the maximum possible efficiency between those two temperatures.
Concept context
Laws of thermodynamics, heat engines, entropy, and gas processes.