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Question

One reversible heat engine operates between 1600 K and T2 K, and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then the temperature T2 must be equal to:

A
600
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B
800
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C
650
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D
675
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Solution

The correct option is B 800
T1=1600K

T2=T2K

T11=T2K

T12=400K

Same input and same output.Then the efficiency is same.
η=T1T2T1

1600T21600=T2400T2

=1600T2T22=1600T2640000

T22=640000
T2=800K

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