Question

demonstrate the rate of photochemical reaction is proportional to its intensity

Answer 1

Photochemical reaction

Photochemical reaction, a chemical reaction initiated by the absorption of energy in the form of light. The consequence of molecules’ absorbing light is the creation of transient excited states whose chemical and physical properties differ greatly from the original molecules. These new chemical species can fall apart, change to new structures, combine with each other or other molecules, or transfer electrons, hydrogen atoms, protons, or their electronic excitation energy to other molecules. Excited states are stronger acids and stronger reductants than the original ground states.

intensity is the number of the photons per area coming to a photochemical substance so the more number of photons coming through an area the more the number of the photochemical reactant increase hence increasing the rate of reaction