일반물리학 1 — Entropy and the Second Law of Thermodynamics: Problem 10

10 In a hypothetical nuclear fusion reactor, the fuel is deuterium gas at a temperature of \(7 \times 10^8 \text{ K}\). If this gas could be used to operate a Carnot engine with \(T_L = 50^\circ\text{C}\), what would be the engine’s efficiency? Take both temperatures to be exact and report your answer to eight significant figures.