Questions
Which of the following statements/expressions is/are correct?
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a
ΔU=Wad
b
Wad=+ve when work is done on the system
c
Wad=-ve, when work is done by the system
d
All of the above
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Correct option is D
The internal energy (U) is characteristic of the state of a system, whereby the adiabatic work, W required to bring about a change of state is equal to the difference between the value of U in one state and that in another state, i.e.ΔU=U2-U1=WadThe positive sign expresses that Wad is positive when work is done on the system. If the work is done by the system, Wad will be negative.Similar Questions
The mathematical expression of first law of thermodynamics is
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