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← ScienceIn a Carnot engine at cryogenic temperatures, which consequence develops when the cold reservoir's temperature approaches absolute zero?
A)Efficiency approaches zero quickly✓
B)Work output becomes theoretically infinite
C)Heat transfer rate reduces nonlinearly
D)Entropy change approaches zero nominally
💡 Explanation
Thermal efficiency is defined as 1-(Tc/Th); therefore, as Tc approaches 0K, Carnot efficiency also approaches zero, because the temperature ratio dominates, rather than an increase in overall work, and it violates the second law.
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