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 600 K respectively. Choose the correct statememt.

Options

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

Answer

B

Explanation

Change in internal energy = `(fnRDeltaT)/(2) = (5)/(2)xx 1 xx R xx (-200)`
=`-500R`