We consider a thermodynamic system. If ΔU represents the increase in its internal energy and W the work done by the system, which of the following statements is true ?
(1) ΔU = –W in an adiabatic process
(2) ΔU = W in an isothermal process
(3) ΔU = –W in an isothermal process
(4) ΔU = W in an adiabatic process
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