| A | B |
|---|
| electromagnetic waves | a transverse wave consisting of changing electric and changing magnetic fields |
| electric field | a field in a region of space that exerts electric force on charged particles; a field produced by electric charges or by changing magnetic fields |
| magnetic field | a field in a region of space that exerts magnetic forces; a field produceed by changing electric fields, or by moving charges |
| elctromagnetic radiation | the transfer of energy by electromagnetic waves |
| photoelectric effect | the emission of electrons from a metal caused by light striking the metal |
| photons | packets of electromagnetic energy |
| intensity | the rate at which a wave's energy flows through a given unit of area |
| electromagnetic spectrum | the full range of electromagnetic radiation |
| amplitude modulation | a method of transmitting a radio signal in which the amplitude of the carrier wave varies while its frequency remains the same |
| frequency modulation | a method of transmitting a radio signal in which the frequency of the carrier wave varies while its amplitude remains the same |
| thermograms | a color-coded picture using variations in infrared radiation to show variations in temperature |
| transparent | a description of a material that allows most of the light that strikes it to pass through |
| translucent | a description of a material that scatters light that passes through it |
| opaque | a description of a material that either absorbs or reflects light that strikes it so nothing can be seen through it |
| image | a copy of an object formed by reflected or refracted rays of light |
| regular reflection | a reflection that occurs when parallel light waves strike a surface and all reflect in the same direction |
| diffuse reflection | reflection that occurs when parallel light waves strike a rough, uneven surface and reflect in many different directions |
| mirage | a false or distorted image |
| polarized light | a type of light including light with waves that vibrate in only one plane |
| scattering | a process by which light is redirected as it passes through a medium |
| dispersion | the process in which white light separates into colors |
| primary colors | three specific that can be combined in varying intensities to create millions of colors |
| secondary color | new color that results when any two of the primary colors are combined |
| complementary colors of light | any two colors of light that combine to form white light |
| pigment | a material that selectively absorbs certain colors of light and reflects other colors |
| complementary colors of pigments | any two colors of pigments that combine to make black pigment |
