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Questions  

The temperature inside a refrigerator is t20C and the room temperature is t10C. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be

a
t2+273t1-t2
b
t1-t2t1+273
c
t1t1-t2
d
t1+273t1-t2

detailed solution

Correct option is D

Heat delivered = Q1COP(β) = t2+273t1-t2 = Q2W = Q1-WW = Q1W-1Q1W = 1+t2+273t1-t2 = t1+273t1-t2

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