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1000 definitions in Biology
Question | Answer |
---|---|
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 |