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← ScienceWhich outcome decreases a heat engine's efficiency if the high-temperature reservoir undergoes a phase change resulting in a decreasing temperature?
A)Isothermal expansion work decreases
B)Adiabatic compression work increases
C)Heat addition occurs at variable T✓
D)Constant volume heat exhaust increases
💡 Explanation
Heat addition at decreasing temperature lowers engine efficiency, because Carnot efficiency depends on the temperature difference; therefore the overall efficiency drops rather than maintaining a high, constant temperature input.
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