The temperature of the system decreases in an

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

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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 $(q = 0)$.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 $(w For an ideal gas,internal energy is a function of temperature only $(U = f(T))$,so a decrease in internal energy results in a decrease in temperature.This is also related to the Joule-Thomson effect,where a gas expanding adiabatically from a high-pressure region to a low-pressure region experiences a temperature drop.

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