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Essmyer Ch.27 Vocab
| Question | Answer |
|---|---|
| in the particle model of electromagnetic radiation, a particle that tracels only at the speed of light and whose energy is related to the frequency of the radiation in the wave model. | photon |
| distance light travels through a vacuum during one year. | light year |
| a wave that is partly electric and partly magnetic and carries energy. emitted by vibrating electric charges. | electromagnetic wave |
| the range of electromagnetic waves extending from radio waves to gamma rays. | electromagnetic spectrum |
| electromagnetic waves of frequencies lower than the red of visible light. | infrared |
| electromagnetic waves of frequecies higher than those of violet light. | ultraviolet |
| term applied to materials that allow light to pass through them in straight lines. | transparent |
| term applied to materials that absorb light without reemission, and consequently do not allow light through them. | opaque |
| a thin beam of light. | ray |
| a shaded region that results when light falls on an object and thus cannot reach into the region on the far side of the object. | shadow |
| the darker part of a shadow where all the light is blocked. | umbra |
| a partial shadow that appears where light from part of the source is blocked and light from another part of the source is not blocked. | penumbra |
| the aligning of vibrations in a transverse wave, usually by filtering out waves of other directions. | polarization |
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