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The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is –20°C, the temperature of the surroundings to which it rejects heat is : |
21°C 31°C 41°C 11°C |
31°C |
$k = \frac{T_2}{T_1 - T_2}$ k = 5 ; T2 = - 20°C T1 = 31°C |
