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Q.

The coefficient of performance of a carnots refrigerator is 9. If the heat extracted from lower temperature is 900 J  then heat transferred to the source will be

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a

100 J

b

1000 J

c

900 J

d

8100 J

answer is B.

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Detailed Solution

COP=Q2w⇒9=900w⇒w=100J

Q1=Q2+w=900+100=1000J

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