Wavelengths electromagnetic radiation bands

When electromagnetic radiation passes through transparent matter, some of it is absorbed. Strong absorption will occur if there is a close match between the frequency of the radiation and the energy of one of the possible electronic or molecular absorption processes characteristic of the medium. A plot of absorbance (A) against wavelength (X) or frequency (v) for a particular material is termed an absorption spectrum. The complexity of the absorption spectrum depends on whether atomic (simple, with a few sharp absorption bands) or molecular (complex, with many broad bands) processes are responsible. 

Fig. 3.8 Classification of electromagnetic radiation in the wavelength range below X of 1200 nm as bands with specific names, and the interaction with molecules M (VUV vacuum-UV).

Regulates and provides constant power needed for the light sources Provides electromagnetic radiation over a range of wavelengths the intensity may vary as a function of wavelength Selects a narrow band of wavelength of choice... 

Molecular weight Synonymous with molecular mass. Monochromatic radiation Ideally, electromagnetic radiation that consists of a single wavelength in practice, a very nan ow band of wavelengths. 

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