A Carnot engine operates between 600 K and 300 K. Its maximum efficiency is: A 25% B 50% C 75% D 100% ✓ Correct Answer: Option B Carnot efficiency = 1 − Tc/Th = 1 − 300/600 = 0.5 = 50%. Practice MCAT Exam Prep Quizzes → Browse All Questions Study Flashcards