Question

"In a photochemical reaction each molecule
of the reacting substance absorbs a single
photon of radiation causing the reaction and
is activated to form the products." This is the
statement of
Select one
A. Grothus-Draper law
B. Lambert-Beer's law
C. Stark-Einstein law
D. Lambert's law​

Answer 1

Stark-Einstein law states that "In a photochemical reaction, a single photon is absorbed by the molecules of the reacting substance that further activate the reaction". (Option C)

• This law was proposed by Stark and Einstein after studying the photochemical reactions by application of the quantum theory of light.
• They observed that each molecule taking part in the reaction absorbs only a single quantum of light.
• The molecule that gains one photon-equivalent energy thus enters the reaction.