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On what factors does the efficiency of C...

On what factors does the efficiency of Carnot engine depend? Even Carnot engine cannot have `100%` efficiency. Why?

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`eta=1-T_2/T_1`. Thus efficiency of a Carnot engine depends on the absolute temperatures of the source and sink. The efficiency will be `100%` if `T_2=0 K.` cannot be realised, engine with `100%` efficiency is not possible.
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