| A | B |
|---|
| electromagnetic wave | transverse wavesthat transfer electrical and magnetic energy |
| electromagnetic radiation | the energy transferred through space by electromagnetic waves |
| polarized light | light that vibrates in only one direction |
| photoelectric effect | the ejection of electrons from a substance when light is shined on it |
| photon | a tiny particle or of light energy |
| electromagnetic spectrum | the complete range of electromagnetic waes placed in order of increasing frequency |
| radio waves | electromagnetic waves with the longest wavelenghts and lowest frequencies |
| radar | a system that uses reflected radio waves to detect objects and measure their distance and speed |
| infrared rays | electromagnetic waves with wavelenghts shorter than radio wwaves, but longer than visible light |
| thermogram | an image that shows regions of different temperatures in different colors |
| visible light | electromagnetic waves that are visible to the human eye |
| ultraviolet rays | electromagnetic waves with wavelenghts shorter than visible light, but longer than X-rays |
| gamma rays | electromagnetic waves with the shortest wavelenghts and the highest frequencies |
| microwaves | radio waves with the shortest wavelenghts and the highest frequencies |
| x-rays | electromagnetic waves with wavelenghts shorter than ultraviolet rays, but longer than gama rays |
| illuminated | word used to describe and object that can be seen because it reflects light |
| luminous | word used to describe an object that can be seen because it emits light |
| spectroscope | an instrument used to view the different colors of light produced by differnt light sources |
| incandescent light | light bulb that glows when a filament inside it gets white hot |
| tungsten-halogen bulb | incandescent light bulb containing a tungsten filament and a halogen gas |
| fluorescent light | light bulb that glows when an electric current causes ultraviolet rays to strike a coating inside a tube |
| vapor light | light bulb containing neon or argon gas along with a small amount of solid sodium or mercury |
| neon light | glass tube containing neon gas that produces light |
| amplitude modulation | a method of transmitting signals by changing the amplitude of a wave |
| frequency modulation | a method of transmitting signals by changing the frequency of a wave |
