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Question

For 100% efficiency of a Carnot engine the temperature of the sink should be

A
273o C
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B
0o C
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C
-273o C
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D
none of these
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Solution

The correct option is C -273o C
The efficiency of the cycle is given as η=1T2T1.
Here T1 is the temperature of the source and T2 is the temperature of the sink.
For 100% efficiency we get 1=1T2T1
T2T1=0

T2=0K=273oC

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