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

Engineering

Physics

Thermodynamics

Question

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

The change in internal energy in the process AB is –350 R

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$Δ U_{CA} = \frac{5}{3} R [200]$

$Δ U_{AB} = \frac{5}{2} R [400]$

$Δ U_{BC} = \frac{5}{2} R \times - 100 = - 500$