wt is the law of photochimical equivalence?,...wt are its significance

hi chase

Law of Photochemical Equivalence states that there is direct and one to one relationship between he number of photons absorbed by a system and the number of excited species produced. This means that one molecule of a substance is reacted with every quantum of radiation that is being absorbed. This law is applied to the primary process of light-induced reactions. Quantum is the unit radiation which is equal to the product of Planck’s constant (h) and frequency of radiation (nu). n chemistry, the quantitative measure of substances is expressed in terms of gram moles, one gram mole comprising 6.02214179 × 10^23 (Avogadro’s number) molecules. Thus, the photochemical equivalence law is restated as: for every mole of a substance that reacts 6.02214179 × 1023 quanta of light are absorbed.