An ELECTROMAGNETICWAVE is a disturbance The range of all EMthat transfers energy frequencies is known as thethrough a field. electromagnetic spectrum.EM waves form when The Electromagnetic Spectrum-atomic particles become longest to shortestelectrically charged. • Radio Waves • MicrowavesMost EM waves that are inthe Earth s environment • Infrared Lightcome from the SUN . • Visible Light • Ultraviolet LightRadiation is the transfer ofenergy in the form of EM • X-Rayswaves. • Gamma RaysEM waves travel 186,000 Gamma Rays are the most harmful tomi/second in a vacuum. humans, but can be used to treat diseases, including cancer.The constant speed of EM waves in avacuum is also known as The Speed of Absorption is theLight. disappearance of an EM wave into the medium .
Transparent materialsallow most of thelight that strike themto pass through. The colors that make up visible light are:Translucent materialstransmit some of the light, • REDbut also causes some light • ORANGEto spread out in all • YELLOWdirections. • GREEN • BLUEOpaque materials do not allow anylight to pass through them because • INDIGOthey reflect and/or absorb light. • VIOLETPolarization is a way of filteringlight so that all of its waves The production of light byvibrate in the same direction. material at high temperatures is called incandescence.Fluorescence is when lightoccurs when a material absorbs Bioluminescence is theEM radiation of one wavelengthand gives off EM radiation of a production of light by livingdifferent wavelength. organisms.