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 :
Answer & explanation
Correct answer: option 2
$k = \frac{T_2}{T_1 - T_2}$
k = 5 ; T2 = - 20°C
T1 = 31°C