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Waves \/\/
| Term | Definition |
|---|---|
| crest | highest point of a wave |
| trough | lowest point of a wave |
| rest position | rest point of a wave (mean of crest and trough) |
| wavelength | distance from plane to other plane (ex. crest --> crest), showed by greek letter lambda |
| amplitude | rest position to crest/trough (depth), larger = more energy |
| frequency | rate of repetition (ex. 10 times per minute, cycles/minute) |
| wave equation | speed = frequency * wavelength |
| electromagnetic radiation | wave pattern of electric + magnetic fields |
| model | representation of object, etc. |
| wave model of light | similarities between light + waves to explain properties |
| additive colour theory | white light comprised of different wavelengths |
| subtractive colour theory | coloured matter selectively absorbs different colours + wavelengths |
| bioluminescence | produced by plants/animals |
| incandescence | produced by objects at different heats |
| fluorescence | emitted by some substances when exposed to electromagnetic radiation |
| phosphor | glows after being exposed to energized particles |
| phosphorescence | stores energy from light, emits slowly over long time period |
| chemiluminsecence | light produced from chemical reactions without increases in temperature |
| triboluminescence | light from friction |
| electric discharge | producing light with electric current through another gas |
| transparency | transmits light freely, absorbs and reflects very little |
| translucecncy | transmits some light, cannot see through clearly |
| opacity | absorbs and reflects, do not transmit |
| umbra | area where all light rays are blocked |
| penumbra | area of partial shadow |
| regular reflection | light strikes a smooth surface, reflects in the same direction, all rays are parallel |
| diffuse reflection | reflects off rough/uneven surface, scattered in different directions |
| law of reflection | light reflects off of a surface, angle of incidence is equal to angle of reflection (mediums are same) |
| plane mirror | flat reflective surface (image appears as far behind obejct, as object is from mirror) |
| focal point | point where light rays appear to meet |
| vertex | middle point of curved mirror |
| focal length | distance from vertex to focal point |
| real image | formed by light rays that converge at image |
| virtual image | image formed by rays passing through mirror (diverge backwards) |
| refraction | bending of light passing through two different media |
| light speed | 3.0 * 10^8 m/s |
| refractive index | n = c/v |
| dispersion | refraction of white light into different wavelengths |
| magnification law | hi/ho = -(di/do) |
| Snell's Law | n1*sinx1 = n2*sinx2 |
Created by:
spock!
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