Electromagnetic Spectrum

The electromagnetic spectrum is the range of energy that characterizes electromagnetic radiation. It propagates through space as combined waves of electrical and magnetic energy. Whenever a magnetic field is generated, a corresponding electric field is also generated, and vice versa. The two fields travel as a wave and are perpendicular to one another. Radiation is any form of energy that travels through space.

electromagnetic spectrum
Electromagnetic Spectrum.

Electromagnetic radiation travels simultaneously as waves of various frequencies, and as particles called photons. Radio waves have a low frequency at approximately 10,000 Hz (hertz — waves per second) and have a very large wavelength of approximately 1000 m (metres), while gamma rays have a very high frequency (1020 Hz) and a very short wavelength (10-12 m).  Visible light is a form of electromagnetic radiation with intermediate frequency and wavelength.  The greater the frequency of the electromagnetic radiation, the greater the amount of energy associated with each photon.

Your body is almost transparent to most forms of electromagnetic radiation. Right now, radio waves carrying music and cell phone conversations are passing directly through your body. The only parts of the electromagnetic spectrum that are directly detectable by our senses are radiant heat (infrared light), visible light, and ultraviolet light. These are converted to heat – and in the case of ultraviolet light, contribute to vitamin D production, skin tanning, and may cause skin cancer. Your body is almost transparent to radio waves, x-rays and gamma rays.