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
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(b)In adiabatic change $Q =$ constant ==> $\Delta Q = 0$
So $\Delta W = - \Delta U \, ( \, \Delta Q = \Delta U + \Delta W)$
So $\Delta W = - \Delta U \, ( \, \Delta Q = \Delta U + \Delta W)$
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