• question_answer The coefficient of performance of a refrigerator working on a reversed Carnot cycle is 4 the ratio of the highest absolute temperature to the lowest absolute temperature is: A) 1.2                               B) 1.25C) 3.33                             D) 4

$COP=\frac{{{T}_{2}}}{{{T}_{1}}-{{T}_{2}}}$ $=\frac{1}{\frac{{{T}_{1}}}{{{T}_{2}}}-1}=4$ $4\frac{{{T}_{1}}}{{{T}_{2}}}-4=1$ $\frac{{{T}_{1}}}{{{T}_{2}}}=\frac{5}{4}=1.25$