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Question

A Carnot engine, having an efficiency of η=0.1 as heat engine, is used as a refrigerator.  If the work done on the system is 10 J, the amount of  energy absorbed from the reservoir at lowertemperature is :



A

1 J

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B

100 J

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C

99 J

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D

90 J

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Solution

The correct option is D

90 J


η=QHQLQH
110=10QH
QH=100J and QHQL=10
100QL=10
QL=10010=90J


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