The rate of a photochemical reaction in a given system is directly related to the intensity of light absorbed by the reactants. This relationship can be described by the following equation:Rate = k I^n [A]^mWhere:- Rate is the rate of the photochemical reaction- k is the rate constant- I is the light intensity- n is the order of the reaction with respect to light intensity- [A] is the concentration of the reactant A- m is the order of the reaction with respect to the reactant AIn most photochemical reactions, the order of the reaction with respect to light intensity n is 1, meaning that the reaction rate is directly proportional to the light intensity. This is known as a first-order reaction with respect to light intensity. In some cases, the order of the reaction with respect to light intensity can be different, such as 0 zero-order or 2 second-order .For a first-order reaction with respect to light intensity, the equation becomes:Rate = k I [A]^mThis means that as the light intensity I increases, the rate of the photochemical reaction will also increase, and vice versa. However, it is important to note that other factors, such as the concentration of the reactants, temperature, and the presence of catalysts or inhibitors, can also affect the rate of the reaction.In summary, the rate of a photochemical reaction generally increases with increasing light intensity, but the exact relationship depends on the order of the reaction with respect to light intensity and other factors that can influence the reaction rate.