One mole of diatomic ideal gas undergoes a cyclic process ABC as shown in figure . The pr ocess BC is adiabatic . The temperatures at A ,B and C are 400 K , 800 K and 600 K respectively .Choose the correct statement :

Question

(a) The change in internal energy in whole cyclic process is 250 R .(b) The change in internal energy in the process CA is 700 R .(c) The change in internal energy in the process AB is -300 R .(d) The change in internal energy in the process BC is -500 R .