NEET2015PhysicsThermodynamicsActual
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
- A20   kJ
- B- 20   kJ
- C20   J
- D- 12   kJ
Correct answer
B. - 20   kJ
Step-by-step solution
Δ U = n C v Δ T T = P V n R Δ T = P 2 V 2 - P 1 V 2 n R Δ U = n R γ - 1 P 2 V 2 - P 1 V 1 n R = P 2 V 2 - P 1 V 1 γ - 1 = - 8 × 10 3 2 5 = - 20 k J