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

On what factors does the efficiency of Carnot engine depend? Even Carn

1.	On what factors does the efficiency of Carnot engine depend? Even Carnot engine cannot have 100% efficiency. Why?
Answer» Solution :`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.