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A carnot engine having an efficiency of ...

A carnot engine having an efficiency of `1/4` is being used as a refrigerator. If the work done on the refrigerator is 5 J, the amount of heat absorbed from the reservoir at lower temperature is:

A

9 J

B

12 J

C

20 J

D

15 J

Text Solution

Verified by Experts

The correct Answer is:
D
Refrigenator cycle is :
`eta =W/Q = W/(W+Q) , 1/4 = 5/(5+Q) , Q=15 J`
Heat absorbed from the reservior at lower temperature is 15 J.
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