| A | B |
|---|
| photon | single particle or packet of light |
| 3x10^8 m/s | speed of light |
| prism | used to separate white light into its |
| light | all light; visible and invisible |
| EM spectrum | a wave that can travel through a vacuum |
| energy level | an orbit of electrons. To move from low to high requires energy |
| radio waves | EM waves that have very low energy and long wavelengths. |
| infrared | EM waves we feel as heat |
| ultraviolet | EM waves with more energy than visible light and can cause sunburns |
| X-rays | EM waves that can pass through skin and have short wavelengths |
| gamma rays | dangersous EM wavees that have very high energy and come from nuclear reactions |
| microwaves | long wavelengths; used in cell phones |
| optical density | Relates to the sluggish tendency of the atoms of a material to maintain the absorbed energy of an electromagnetic wave in the form of vibrating electrons before reemitting it as a new electromagnetic disturbance |
| electromagnetic waves | wave produced by a vibrating electrical charge |
| refraction | the bending of a light wave as it passes fom one material to another material |
| index of refraction | the speed of light in vacuum divided by the speed of light in the medium. |
| sfa | slow to fast bends away from normal |
| fst | fast to slow bends toward normal |
| medium | material through which light travels |
