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Which of the following statements is true? ( $\Delta \mathrm{U}=$ increase in internal energy, $\mathrm{dW}=$ work done by the system)
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In an adiabatic process $\Delta \mathrm{U}=-\mathrm{dW}$
We have $\Delta \mathrm{Q}=\Delta \mathrm{U}+\Delta \mathrm{W}$
In a adiabatic process, $\Delta \mathrm{Q}=0$ $\therefore \Delta \mathrm{U}=-\Delta \mathrm{W}$
In a adiabatic process, $\Delta \mathrm{Q}=0$ $\therefore \Delta \mathrm{U}=-\Delta \mathrm{W}$
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