Answer: 600 J.
- A 400 J
- B 500 J
- C 600 J
- D 1000 J
Correct answer: C. 600 J
Explanation: Energy conservation: Q<sub>hot</sub> = W + Q<sub>cold</sub>. Q<sub>cold</sub> = 1000 - 400 = 600 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.