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Question

What is the approximate coefficient of performance of a Carnot refrigerator working between $$30^oC$$ and $$0^oC$$?


A
0
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B
1
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C
9
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D
10
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Solution

The correct option is C $$9$$
$$30^0C$$ is$$273+30=310K$$  and $$0^0C=273+0=273K$$
Coefficient of performance of a refrigerator is given as
$$COP=\dfrac{T_{cold}}{T_{hot}-T_{cold}}$$

$$=\dfrac{273}{(310-273)}=9.1$$

Physics

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