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| Yellow | A Wisdom Archive on Yellow |  | Yellow A selection of articles related to Yellow:
In the English language, yellow has traditionally been associated with jaundice and cowardice. In American slang, a coward is said to be "yellowbellied" or "yellow.": In China, yellow is associated with prosperity, and also a "Yellow Picture" means a pornographic film. Because it is similar to the gold color and precious metals such as gold or bronze, yellow is associated with coinage and bullion
Yellow is a color with a wavelength 565-590 nanometers. It is one of the subtractive primary colors, and its complementary color is blue. However, because of the characteristics of paint pigments used in the past, painters traditionally regard its complement as purple
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yellow, Yellow, Yellow - Associations and expressions, Yellow - Ethnicity, Yellow - Geography, Yellow - Government and politics, Yellow - Music, Yellow - Other, Yellow - Plants and animals, Yellow - Sports, Yellow - Transportation, Yellow - Yellow pigments, List of colors
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 |  |  | | * Encyclopedia II - X-ray - History Among the important early researchers in X-rays were Professor Ivan Pului, Sir William Crookes, Johann Wilhelm Hittorf, Eugen Goldstein, Heinrich Hertz, Philipp Lenard, Hermann von Helmholtz, Nikola Tesla, Thomas Edison, Charles Glover Barkla, Max von Laue, and Wilhelm Conrad Röntgen.
Physicist Johann Hittorf (1824 - 1914) observed tubes with energy rays extending from a negative electrode. These rays produced a fluorescence when they hit the glass walls of the tubes. In 1876 the effect was named "cathode rays" by Eugen Goldstein. La ...
Read more here: » X-ray: Encyclopedia II - X-ray - History |
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 |  |  | | * Encyclopedia II - Light - Speed of light Although some people speak of the "velocity of light", the word velocity should be reserved for vector quantities, that is, those with both magnitude and direction. The speed of light is a scalar quantity, having only magnitude and no direction, and therefore speed is the correct term.
The speed of light has been measured many times, by many physicists. The best early measurement is Ole Rømer's (a Danish physicist), in 1676. By observing the motions of Jupiter and one of its moons, Io, with a telescope, and noting discr ...
Read more here: » Light: Encyclopedia II - Light - Speed of light |
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