A system goes from A to B via two processes I and II as shown in the figure. If ΔU1 and ΔU2 are the changes in internal energies in the processes I and II respectively, the
(1) ΔU1 = ΔU2
(2) relation between ΔU1 and ΔU2 can not be determined
(3) ΔU2 > ΔU1
(4) ΔU2 < ΔU1
