Thermodynamics Question 283

Question: A refrigerator with coefficient of performance releases 200 J of heat to a hot reservoir. Then the work done on the working substance is

Options:

A) 1003J

B) 100J

C) 2003J

D) 150J

Show Answer

Answer:

Correct Answer: D

Solution:

[d] The coefficient of performance of a refrigerator is given by α=Q2W=Q2Q1Q2

Substituting the given values, we get 13=Q2200Q2

200Q2=3Q24Q2=200

or Q2=2004J=50J

W=Q1Q2=200J50J=150J



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