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

Question

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( A ) The change in internal energy in the process CA is 700 R.
( B ) The change in internal energy in whole cyclic process is 250 R.
( C ) The change in internal energy in the process BC is - 500 R.
( D ) The change in internal energy in the process AB is -350 R.