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A Carnot engine, whose efficiency is 40%...

A Carnot engine, whose efficiency is `40%`, takes in heat from a source maintained at a temperature of 500K. It is desired to have an engine of efficiency `60%`. Then, the intake temperature for the same exhaust (sink) temperature must be:

A

efficiency of Carnot engine cannot be made larger than 50%

B

1200K

C

750K

D

600K

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