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Punkout

1000 definitions in Biology

QuestionAnswer
photon in the particle model of electromagnetic radiation, a particle travels only at the speed of light and whose energy is related to the frequency of the radiation 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 vibrating electric charges
electromagnetic spectrum the range of electromagnetic waves extending from radio waves to gamma rays
infrared electromagnetic waves of frequencies lower than the red of visible light
ultrasonic term applied to sound frequencies above 20000 hertz, normal upper limit of human hearing
transparent term applied to materials that allow light to pass through in straight lines
opaque term applied to materials 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 fails on an object and thus cannot reach into the region on the far side of the 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 wce, usually by filtering out waves of other directions
Created by: 14_aherber
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