Category: Everyday Science | Last updated: 2026-09-18

The Carnot efficiency of a heat engine operating between 600K (hot) and 300K (cold) is:

A) 25%

B) 50%

C) 75%

D) 100%

Explanation

η_Carnot = 1 − T_cold/T_hot = 1 − 300/600 = 0.5 = 50%.

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