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Physics - Semester 2 - Chapter 27 Key Terms

Electromagnetic spectrum The range of electromagnetic waves extending from radio waves to gamma rays
Electromagnetic wave A wave that is partly electric and partly magnetic and carries energy. Emitted by vibrating electric charges
Infrared Electromagnetic waves of frequencies lower than the red of visible light
Light-year The distance light travels through a vacuum during one year
Opaque Term applied to materials that absorb light without reemission, and consequently do not allow light through them
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
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 radiation in the wave model
Polarization The aligning of vibrations in a transverse wave, usually by filtering out waves of other directions
Ray A thin beam of light
Shadow A shaded region that results when light falls on an object and this cannot reach into the region on the far side of the object
Transparent Term applied to materials that allow light to pass through them in straight lines
Ultraviolet Electromagnetic waves of frequencies higher than those of violet light
Umbra The darker part of a shadow where all the light is blocked
Created by: HanBeth07