Answer: the second law of thermodynamics.
- A the first law of thermodynamics
- B Boyle law
- C the zeroth law
- D the second law of thermodynamics
Correct answer: D. the second law of thermodynamics
Explanation: The Carnot theorem is a direct consequence of the second law of thermodynamics.
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.