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The C.O.P. of a reversed Carnot refrigerator is 5. What is the ratio of highest temperature to lower temperature?

The C.O.P. of a reversed Carnot refrigerator is 5. What is the ratio of highest temperature to lower temperature? Correct Answer 1.2

As C.O.P. of the refrigerator working on the Carnot cycle is given by, C.O.P. = T1 / (T2 − T1) 5 = T1 / (T2 − T1) (T2 − T1) / T1 = 1 / 5 (T2 / T1) − (T1 / T1) = 0.2 T2 / T1 − 1 = 0.2 T2 / T1 = 1.2.

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