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Chapter27 Vocabulary

Unruh's Chapter 27 Vocabulary

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. photon
the 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 frequencies 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 directions. polarization
Created by: unruh



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