One mole of diatomic ideal gas undergoes a cyclic process ABCA as shown in figure. The process BC is adiabatic. The temperatures at A,B and C are 400K, 800K and 600K respectively. Choose the correct statement :
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a
The change in internal energy in the process BC is – 500R
b
The change in internal energy in whole cyclic process is 250 R
c
The change in internal energy in the process CA is 700R
d
The change in internal energy in the process AB is – 350R