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Questions  

A refrigerator, whose coefficient of performance β is 4, extracts heat from the cooling compartment at the
rate of 400 J per cycle. How much work per cycle is required to operate the refrigerator?  

a
100 J
b
200 J
c
50 J
d
25 J

detailed solution

Correct option is A

β=Q2W⇒4=400W⇒ W=100J

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