System goes from A to B via two processes, I and II as shown in figure. If ΔUI and ΔUII are changes in internal energies in the processes I and II repectively, then:
Correct answer: B. UI = ΔUII
- A. UII > ΔUI
- B. UI = ΔUII
- C. UII < ΔUI
- D. Relation between ΔUI and ΔUII cannot be determined
Explanation
As internal energy is a state function therefore change in internal energy does not depends upon the path followed i.e. ΔUI=Δ UII
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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