What is the change in the system’s internal energy?
An ideal gas system undergoes an adiabatic process in which it expands and does 20 J of work on its environment. What is the change in the system’s internal energy?
a. –20 J
b. –5 J
c. 0 J
d. 20 J
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Heat transfer to the system = work done by the system + change in internal energy of the system
For adiabatic process, heat transfer to the system = 0
Therefore
change in internal energy = - work done = -20 J
Ans (a)