One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure,

The change in internal energy of the gas during the transition is :

Options

A. `-20kJ`
B. `20J`
C. `-12kJ`
D. `20kJ`

Answer

A

Explanation

`Delta U = f/2 nR DeltaT " " f to ` degree of freedom
`rArr DeltaU = 5/2 (P_f V_f - P_iV_i)`
` = 5/2 (2 xx 10^3 xx 6 - 5 xx 10^3 xx 4) = -20kJ`.