The extent to which a sample absorbs light depends strongly upon the wavelength of light. For this reason, spectrophotometry is performed using monochromatic light.
Monochromatic light is light in which all photons have the same wavelength.
In analyzing a new sample, a chemist first determines the sample's absorbance spectrum. The absorbance spectrum shows how the absorbance of light depends upon the wavelength of the light. The value of l max is important for several reasons. This wavelength is characteristic of each compound and provides information on the electronic structure of the analyte. Determine the absorbance spectrum of a sample solution.