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Question
A given system undergoes a change in which the work done by the system equals the decrease in its internal energy. The system must have undergone an ______.
Options
isothermal change
adiabatic change
isobaric change
isochoric change
MCQ
Fill in the Blanks
Solution
A given system undergoes a change in which the work done by the system equals the decrease in its internal energy. The system must have undergone an adiabatic change.
Explanation:
As According to first law of thermodynamics,
dQ = dU + dW
As dW = -dU
⇒ dQ = dU - dU = 0
The change must be adiabatic.
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First Law of Thermodynamics
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