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Term
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Definition
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| speed of light in a vaccuum | 3.0 x 108 meters per second (18 million km/h or 186,000 mph) |
| electromagnetic spectrum | Radiation emitted by electrons as they drop their orbits around an atom. |
| wavelength | The distance between adjacent crests or troughs. ( l ) |
| speed | The rate which in the crests or troughs move foward. ( v ) |
| period | The time that passes by between passing crests or troughs. ( T ) |
| frequency | The number of crests or troughs that pass by in one unit of time. ( f ) |
| ray | A line of light originating from a source that always intersects the waves at right angles. |
| photon | The theoretical wave/particle |
| normal to a surface | Perpendicular to the surface. |
| refraction | The changing in the angle that light travels in when it goes through different substances. |