A thermodynamic process is shown in the figure.
The pressures and volumes corresponding to some points in the figure are
PA = 3 × 104 Pa
VA = 2 × 10-3 m3
PB = 8 × 104 Pa
VD = 5 × 10-3m3.
In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be
(a) 560 J
(b) 800 J
(c) 600 J
(d) 640 J










