| A | B |
|---|
| electromagnetic waves | transverse waves consisting of changing electric fields and changing magnetic fields |
| electric field | a region of space exerts electric forces on charged particles |
| magnetic field | a region of space produces magnetic forces |
| electromagnetic radiation | the transfer of energy by electromagnetic waves traveling through matter or across space |
| 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 frequencies of electromagnetic radiation |
| amplitude modulation | the amplitude of the wave is varied |
| frequency modulation | the frequency of the wave is varied |
| thermograms | color coded pictures that show variations in temperature |
| transparent | transmits light and allows most light to pass through |
| translucent | scatters light causing objects to have little or no detail |
| opaque | allows no light to pass through the object |
| image | copy of an object formed by reflected or refracted waves of light |
| regular reflection | occurs when parallel light waves strikes a surface and reflects in same direction |
| diffuse reflection | occurs when parallel light strikes an uneven surface and reflects in different directions |
| mirage | a false or distorted image |
| refraction | bending of light |
| polarization | light with waves that vibrate in only one plane |
| scattering | light is redirected as it passes through a medium |
| dispersion | process in which white light separates into colors |
| primary colors | three specific colors that can be combined in varying amounts to create all possible colors |
| secondary color | combination of two primary colors |
| complementary colors of light | two colors of light that combine to form white light |
| pigment | material that absorbs some colors of light and reflects other colors |
| complementary colors of pigment | two colors of pigments that combine to make black pigment |
| luminous | objects that give off their own light |
| incandescent | light is produced when an object gets hot enough to glow |
| fluorescence | material absorbs light at one wavelength and then emits light at a longer wavelength |
| laser | device that generates a beam of coherent light |
| coherent light | light in which waves have the same wavelength, and the crests and troughs are lined up |
| neon light | emit light when electrons move through a gas or a mixture of gases inside glass tubing |
