For an ideal gas with initial pressure and volume Pi and Vi respectively, a reversible isothermal expansion happens, when its volume becomes V0. Then it is compressed to its original volume Vi by a reversible adiabatic process. If the final pressure is Pf then which of the following statements is true?

English

For an ideal gas with initial pressure and volume Pi and Vi respectively, a reversible isothermal expansion happens, when its volume becomes V0.

Question

For an ideal gas with initial pressure and volume P_i and V_i respectively, a reversible isothermal expansion happens, when its volume becomes V₀. Then it is compressed to its original volume V_i by a reversible adiabatic process. If the final pressure is P_f then which of the following statements is true?