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8th- EM Spectrum
| Term | Definition |
|---|---|
| light | a form of energy or radiation that may or may not be visible |
| visible light | the only part of the electromagnetic spectrum that can be detected by your eye (we see it as color) |
| wave model | energy travels in the form of a wave at about 300,000 km/s, or 670,616,631 miles per hour (the speed of light) |
| photon model | also called the particle model, stating that light is made of bundles of energy called photons that travel in a beam or stream of light |
| ray model | a light ray is an imaginary line running in the direction that light travels |
| white light | made of all of the colors of the visible spectrum |
| wavelength | how long a wave is; measured from crest to crest or trough to trough |
| frequency | how many waves pass a certain point in a certain amount of time |
| reflect | what light does when it bounces off a surface; this is the reason we see color |
| absorb | what light does that it is taken in by a surface; this is what happens to all colors that we don't see when we look at a substance |
| refract | what light does when it is bent due to a change in medium (air to water, air to glass, etc.) which can cause you to see the entire visible spectrum |
| prism | an object that can refract white light into all of the colors |
| continuous spectrum | unbroken band of color that shows that the source is emitting light in all visible wavelengths (fancy word for rainbow) |
| emission spectrum | series of unevenly spaced lines of color and brightness showing that the source is emitting only certain wavelengths |
| absorption spectrum | contains black lines where energy is absorbed (opposite of the emission spectrum) |
| spectroscope | device that separates visible light into its components |
| radio waves | radiation with the lowest frequency, longest wave length, and lowest energy that is able to travel over the longest distances; good for transmitting information from far away |
| microwaves | radiation with a lower frequency, longer wavelength, and lower energy than visible light that is able to heat water molecules; used for phone calls and radar |
| terahertz | radiation with a lower frequency, longer wavelength, and lower energy than visible light; used for imaging gas and dust in space and full body scanners |
| infrared radiation | radiation with a lower frequency, longer wavelength, and lower energy than visible light and is detected by humans as heat; used for imaging organisms and objects in space to see their temperature |
| ultraviolet | radiation with a higher frequency, shorter wavelength, and higher energy than visible light that we get from our Sun; causes sunburn, sterilize medical equipment, and check for counterfeit money |
| x-rays | radiation with a higher frequency, shorter wavelength, and higher energy than visible light that is able to penetrate human skin to create an image of bones and ulcers; large amounts are dangerous to humans |
| gamma rays | radiation the highest frequency, shortest wavelength, and highest energy; most dangerous to humans (kills cells) and is released from nuclear decay |
Created by:
holtzmanscience
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