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← ScienceWhich outcome occurs when an ideal Carnot engine's hot reservoir temperature falls during isothermal expansion?
A)Engine efficiency decreases proportionally.✓
B)Refrigeration cycle becomes more efficient.
C)Work output ceases instantaneously.
D)Entropy remains unaffected practically.
💡 Explanation
Carnot efficiency depends on the temperature difference; heat leaks cause a drop in temperature, reducing efficiency because efficiency is proportional to (1- Tc/Th) with Th decreasing. Therefore the device is negligibly efficient, rather than improved refrigeration or ceasing of operation without heat input change.
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