Answer: 150 J.
- A 600 J
- B 450 J
- C 300 J
- D 150 J
Correct answer: D. 150 J
Explanation: η = 1 - 300/400 = 0.25, so W = 0.25 × 600 = 150 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.