The COP of refrigeration cycle is given by

• A. 1 / {(p1/p2)^ɣ/(ɣ-1)]} – 1
• B. 1 / {(p1/p2)^(ɣ-1)/ɣ]} – 1
• C. 1 / {(p1/p2)^(ɣ-1)/ɣ]} + 1
• D. none of the mentioned