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Then I found a problem where I have a reversible cycle made of an isochoric, adiabatic and isotherm. I report here the data. Computing the efficiency as work/absorbed heat I get 0.12 while if I use 1-Tc/Th I have 0.25. Why are the twos not the same?

The problem states:

"A monoatomic ideal gas is in a state A where the temperature is 300K, p= 2atm and V = 20L. Through an isochoric process the temperature rise up to 400K (state B); through an adiabatic process the gas arrive in a state C where Tc = Ta = 300K and finally through an isotherm process it gets back to A. Compute the efficiency of the cycle.