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Sorensen Chapter 27

Sorensen Chapter 27 Vocab

QuestionAnswer
Photon In the particle model of electromagnetic radiation, a particle that travels only at the speed of light and whose energy is related to the frequency of the radiation in the wave model.
Light-year The distance light travels through a vacuum during one year.
Electromagnetic Wave A wave that is partly electric and partly magnetic and carries energy. Emitted by vibration electric charges.
Electromagnetic Spectrum The range of electromagnetic waves extending from radio waves to rays.
Infrared Electromagnetic waves of frequencies lower than the red of visible.
Ultraviolet Electromagnetic waves of frequencies higher than those of violet light.
Transport Term applied to materials that allow light to pass through them in straight lines.
Opaque Term applied to materials that absorb light without reemission, and consequently do not allow light through them.
Ray A thin beam of light.
Shadow A shaded region that results when light falls on an object and thus cannot reach into the region on the far side of object.
Umbra The darker part of a shadow where all the light is blocked.
Penumbra 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.
Polarization The aligning of vibrations in a transverse wave, usually by filtering out waves of other directions.
Created by: msorensen
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