The Electromagnetic Spectrum

The electromagnetic (EM) spectrum consists of all forms of EM radiation, from direct current (DC) to light to gamma rays. A chart of 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. The overall EM spectrum into three main subregions: DC to light spectrum, optical spectrum, and light to gamma ray spectrum. The radiofrequency (RF) range of the EM spectrum is the wavelength band suitable for utilization in radio communications from 10 kHz to 300 MHz. Some radio waves serve as the carriers of low-frequency audio signals; other radio waves are modulated by video and digital information. Radiation from electronic devices produces EM waves in both the microwave and the RF bands. The power frequency range of the EM spectrum is the wavelength band suitable for generating, transmitting, and consuming low-frequency prime power, extending from 10 kHz to DC.