Question

If the coefficient of performance of a refrigerator is 5 and operates at the room temperature 27C, the temperature inside the refrigerator is:

• A. 240 K
• B. 250 K
• C. 230 K
• D. 260 K

Answer 1

The correct option is B 250 K

For a refrigerator-

$Cop=\frac{T_{cold}}{T_{hot}-T_{cold}}=5=\frac{T_{cold}}{(27+273)-T_{cold}}\Rightarrow 1500-5T_{cold}=T_{cold}\Rightarrow 1500=6T_{cold}\Rightarrow T_{cold}=250K$