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Hue
hue The perceived main wavelength of light defining a color. White, gray, and black may be considered as colors but not hues.... Read more |
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Redshift
Redshift In astronomy, when matter moves away from an observation point, its light spectrum displays a redshift. A redshift is one type of Doppler effect. Named for Austrian physicist Christian Johann Doppler (1803–1853), this principle states that if a light (or sound) source is moving away... Read more |
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Fluorescent antibody technique
Immunofluorescence Immunofluorescence refers to the combination of an antibody and a compound that will fluoresce when illuminated by light of a specific wavelength. The duo is also referred to as a fluorescently labeled antibody. Such an antibody can be used to visually determine the location of... Read more |
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Hubbles law
Hubble's law in astronomy, statement that the distances between galaxies (see galaxy ) or clusters of galaxies are continuously increasing and that therefore the universe is expanding. Discovery and Explanation of the Red Shift Edwin Hubble first proposed this law in 1929 based on a study of the... Read more |
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Raman effect
Raman effect , appearance of additional lines in the spectrum of monochromatic light that has been scattered by a transparent material medium. The effect was discovered by C. V. Raman in 1928. The energy and thus the frequency and wavelength of the scattered light is changed as the light either... Read more |
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prism
prism in optics, a piece of translucent glass or crystal used to form a spectrum of light separated according to colors. Its cross section is usually triangular. The light becomes separated because different wavelengths or frequencies are refracted (bent) by different amounts as they enter the... Read more |
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color
color effect produced on the eye and its associated nerves by light waves of different wavelength or frequency. Light transmitted from an object to the eye stimulates the different color cones of the retina, thus making possible perception of various colors in the object. See also light ; ... Read more |
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absorption spectrum
absorption spectrum A graph that shows the percentage of each wavelength of light absorbed by a pigment (e.g. chlorophyll, which absorbs mainly in the red and blue parts of the spectrum).... Read more |
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afterglow
afterglow The electromagnetic radiation often observed after a gamma‐ray burst (GRB). As a shockwave of gas from a GRB ploughs into the surrounding gas and dust, kinetic energy is converted into radiation, creating the afterglow. The emission is synchrotron radiation from electrons... Read more |
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Compton effect
Compton effect [for A. H. Compton ], increase in the wavelengths of X rays and gamma rays when they collide with and are scattered from loosely bound electrons in matter. This effect provides strong verification of the quantum theory since the theoretical explanation of the effect requires that... Read more |
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