The temperature dependence of a photochemical reaction rate can be described using the Arrhenius equation, which relates the rate constant k of a reaction to the temperature T and activation energy Ea of the reaction:k = A * e^-Ea / RT where:- k is the rate constant- A is the pre-exponential factor also known as the frequency factor - Ea is the activation energy- R is the gas constant 8.314 J/molK - T is the temperature in KelvinIn photochemical reactions, the reaction rate is also dependent on the intensity of light I and the absorption cross-section of the reactant molecules. The overall rate equation for a photochemical reaction can be written as:Rate = k * I * * [Reactant]As the temperature increases, the rate constant k generally increases, leading to a faster reaction rate. However, the exact temperature dependence of a specific photochemical reaction will depend on the activation energy Ea and the pre-exponential factor A for that reaction. In some cases, the temperature dependence may be weak or negligible, while in others, it may be significant. Additionally, the absorption cross-section of the reactant molecules may also be temperature-dependent, further influencing the temperature dependence of the reaction rate.