Answer: 1250 J.
- A ≈623 J
- B ≈831 J
- C ≈1250 J
- D ≈2490 J
Correct answer: C. ≈1250 J
Explanation: Adiabatic: W = -ΔU = -nC<sub>v</sub>ΔT = -(3/2)(8.31)(300-400) ≈ 1250 J.
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.