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(B) According to the first law of thermodynamics,$\Delta Q = \Delta U + \Delta W$,where $\Delta Q$ is the heat supplied to the system,$\Delta U$ is th

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adiabatic change

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(B) According to the first law of thermodynamics,$\Delta Q = \Delta U + \Delta W$,where $\Delta Q$ is the heat supplied to the system,$\Delta U$ is the change in internal energy,and $\Delta W$ is the work done by the system.Given that the work done by the system equals the decrease in its internal energy,we have $\Delta W = -\Delta U$,which implies $\Delta U + \Delta W = 0$.Substituting this into the first law equation,we get $\Delta Q = 0$.$A$ process in which there is no exchange of heat $(\Delta Q = 0)$ with the surroundings is defined as an adiabatic process.Therefore,the system must have undergone an adiabatic change.

$A$ 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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