Q.

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 400K, 800K and 600K respectively. Choose the correct statement :
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a

The change in internal energy in whole cyclic process is 250 R

b

The change in internal energy in the process BC is –500R

c

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

d

The change in internal energy in the process CA is 700R

answer is A.

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Detailed Solution

W=nRΔTγ1=R(200)17/5=500R

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