In adiabatic expansion _.
Correct answer: B. ΔU = negative
- A. ΔU = 0
- B. ΔU = negative
- C. ΔU = positive
- D. ΔW = 0
Explanation
An adiabatic system is an isolated system where no heat transfer takes place. ΔU=q-ΔWHere, when no heat exchange takes place, so q=0, and the equation becomes ΔU=-ΔW So, the correct option is ΔU=-ve
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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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