Answer: Stops completely.
- A Is maximum
- B Stops completely
- C Continues at minimum level
- D Is undefined
Correct answer: B. Stops completely
Explanation: At absolute zero, all thermal motion stops. This is the lowest possible temperature (third 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.