Which outcome is observed when the temperature of a Carnot engine's cold reservoir increases during operation?

💡 Explanation

When the cold reservoir temperature increases, the Carnot efficiency (1 - Tc/Th) decreases because the temperature difference narrows, causing a smaller fraction of the heat input to be converted to work non-linearly. Therefore, efficiency drops, rather than power rising, heat input falling, or entropy decreasing, which do not directly correlate with this temperature change.

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