The document describes a Carnot cycle diagram and asks what amount of heat is rejected to the surroundings. A Carnot cycle consists of four reversible processes: isentropic compression, isothermal heat transfer at a high temperature TH, isentropic expansion, and isothermal heat transfer at a low temperature TL where heat is rejected. The amount of heat rejected is Tc(S2-S1), where Tc is the low temperature and S2-S1 represents the change in entropy during the heat rejection process.