ABSTRACT
The electromagnetic (EM) spectrum consists of all forms of EM radiation, for example, EM waves propagating through space, from direct current (DC) to light to gamma rays. The EM spectrum can be arranged in order of frequency or wavelength into a number of regions, usually wide in extent, within which the EM waves have some specified common characteristics, for example, those characteristics relating to the production or detection of radiation. Note that in this section, specific frequency ranges are called bands; several contiguous frequency bands are called spectrums; and subfrequency ranges within a band are called segments. A common example is the spectrum of the radiant energy in white light, as dispersed by a prism, to produce a rainbow of its constituent colors.
