Class 11 NEET Physics Thermodynamics and Kinetic Theory

Change in internal energy is path independent and depends only on the initial and final states.
As the initial and final states in the three processes are same.
Therefore, ΔU1=ΔU2=ΔU3
Workdone, W= Area under P−V graph
As area under curve 1 > area under curve 2 > area under curve 3
∴W1>W2>W3
According to first law of thermodynamics,
Q=W+ΔU
As W1>W2>W3 and ΔU1=ΔU2=ΔU3
∴Q1>Q2>Q3