A gas is expanded from volume V_0 to 2V_0 under three different processes. Process 1 is an isobaric process, process 2 is isothermal and process 3 is

Explanation :

For isobaric process

PV = nRT (Ideal gas equation )

P=constant

So

In expansion volume will increase so Temperature will also increase

If Temperature will increase internal energy will increase so

△ U = U₁ > 0

For Isothermal  process :△T=0

△ U= U₂ = 0

For Adiabatic process  Q=0

△U = Q + W

△U = W

In expansion work done is negative so

△ U= U₃ < 0

Hence U₁ >  U₂ >  U₃