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(D) In an adiabatic process,there is no exchange of heat between the system and the surroundings,so $q = 0$. According to the first law of thermodynam

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Adiabatic expansion

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(D) In an adiabatic process,there is no exchange of heat between the system and the surroundings,so $q = 0$. According to the first law of thermodynamics,$\Delta U = q + w$. Since $q = 0$,$\Delta U = w$. In an adiabatic expansion,the system does work on the surroundings,so $w This implies $\Delta U Since the internal energy of an ideal gas is a function of temperature $(U \propto T)$,a decrease in internal energy leads to a decrease in the temperature of the system.

The temperature of a system decreases in which of the following processes?

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