The coefficient of performance of a Carnot refrigerator working between ${30^o}C$ and ${0^o}C$ is
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(c) Coefficient of performance
$K = \frac{{{T_2}}}{{{T_1} - {T_2}}} = \frac{{273}}{{303 - 273}} = \frac{{273}}{{30}} = 9$
$K = \frac{{{T_2}}}{{{T_1} - {T_2}}} = \frac{{273}}{{303 - 273}} = \frac{{273}}{{30}} = 9$
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