One mole of diatomic ideal gas undergoes a cyclic process ABC as shown in figure. The process BC is adiatomic. The temperature of A, B and C are 400 K, 800 K and 600 K respectively. Choose the correct statement ____

One mole of diatomic ideal gas undergoes a cyclic process ABC as shown

1.	One mole of diatomic ideal gas undergoes a cyclic process ABC as shown in figure. The process BC is adiatomic. The temperature of A, B and C are 400 K, 800 K and 600 K respectively. Choose the correct statement ____
Answer» The change in internal energy in the process AB is - 350 R. The change in internal energy in the process BC is - 500 R. The change in internal energy in whole CYCLIC process is 250 R. The change in internal energy in the process CA is 700 R. Solution :`DELTAU=nC_V DeltaT` for diatomics gas `C_V=5/2 R` `THEREFORE DeltaU=(1)5/2 R(T_2-T_1)` `=(1)(5/2R)(600-800)` `=-(5R)/2xx200` =-500 R