Electromagnetic waves
X-rays
A form of electromagnetic radiation with very high frequency and energy. X-rays lie between ultraviolet radiation and gamma radiation on the electromagnetic spectrum.
Ozone Layer
A layer in the earth's stratosphere at an altitude of about 6.2 miles (10 km) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun.
Photon
A particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
Microwaves
An electromagnetic wave with a wavelength in the range 0.001-0.3 m, shorter than that of a normal radio wave but longer than those of infrared radiation. Microwaves are used in radar, in communications, and for heating in microwave ovens and in various industrial processes.
Gamma rays
Electromagnetic radiation with wavelengths shorter than approximately one tenth of a nanometer.
Frequency
In physics, the number of crests of a wave that move past a given point in a given unit of time. The most common unit of frequency is the hertz (Hz), corresponding to one crest per second. The frequency of a wave can be calculated by dividing the speed of the wave by the wavelength.
Infrared waves
Infrared waves are electromagnetic radiation of a particular wavelength or color that we have named 'infrared
Radiant Energy
Is energy that travels by waves or particles, particularly electromagnetic radiation such as heat or x-rays.
Electromagnetic waves
One of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity and that include radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
Ultraviolet waves
Radiation in the part of the electromagnetic spectrum where wavelengths are just shorter than those of ordinary, visible violet light but longer than those of x-rays.
Radio waves
Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Also radio waves have the longest wavelength.
Global Positioning System(GPS)
The GPS (Global Positioning System) is a "constellation" of 24 well-spaced satellites that orbit the Earth and make it possible for people with ground receivers to pinpoint their geographic location. The location accuracy is anywhere from 100 to 10 meters for most equipment.
Wavelength
The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
Carrier wave
The process of superimposing the "electrical image" of the sound information on the carrier wave is called modulation, and there are two commonly used schemes: amplitude modulation (AM) and frequency modulation (FM).
Visible light
Visible light is a form of electromagnetic (EM) radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves. Generally, visible light is defined as the wavelengths that are visible to most human eyes.
