12.44: A monatomic ideal gas is the working substance for a refrigerator that u
w pflsj7fs -70 ;fn+qmndergoes the cyclic process (ABCDA) shown in the PV diagram. The processes ar
+;ln 770m sqwpjff-s fe all isochoric or isobaric with pressures between $P_0$ and $2P_0$ and volumes between $V_0$ and 2$V_0$ . What is the coefficient of performance for this refrigerator?