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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.
|the distance light travels through a vacuum during one year.
|a wave that is partly electric and partly magnetic and carries energy. Emitted by vibrating electric charges.
|the range of electromagnetic waves extending from radio waves to gamma rays
|electromagnetic waves of frequencies lower than the red of visible light
|electromagnetic waves of frequencies higher than those of violet light
|term applied to materials that allow light to pass through them in straight lines
|term applied to materials that absorb light without reemission, and consequently do not allow light through them.
|a thin beam of light
|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
|the darker part of a shadow where all the light is blocked
|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
|the aligning of vibrations in a transverse wave, usually by filtering out waves of directions.