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Peter II, czar of Russia
(Encyclopedia) Peter II, 1715–30, czar of Russia (1727–30). A grandson of Peter I and the son of the czarevich Alexis, he succeeded on the death of Catherine I. He was too young to rule, but he…optics
(Encyclopedia) optics, scientific study of light. Physical optics is concerned with the genesis, nature, and properties of light; physiological optics with the part light plays in vision; and…Raman effect
(Encyclopedia) Raman effectRaman effecträˈmən [key], appearance of additional lines in the spectrum of monochromatic light that has been scattered by a transparent material medium. The effect was…book of hours
(Encyclopedia) book of hours, form of prayer book developed in the 14th cent. from the prayers of clerics appended to the main service. The subjects of the miniature illustrations (see miniature…On a Drop of Dew
On a Drop of Dew See how the Orient Dew, Shed from the Bosom of the Morn Into the blowing Roses, Yet careless of its Mansion new; For the clear Region where 'twas born Round in its self…John Day Dam
(Encyclopedia) John Day Dam, 219 ft (67 m) high and 5,640 ft (1,719 m) long, on the Columbia River between Oregon and Wash.; built between 1959 and 1968 by the U.S. Army Corps of Engineers. It is an…color
(Encyclopedia) 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…Poems and Songs of Robert Burns: Song-O Tibbie, I Hae Seen The Day
by Robert Burns Song-Handsome NellSong-I Dream'd I LaySong-O Tibbie, I Hae Seen The Day Tune-"Invercauld's Reel, or Strathspey." Choir.—O Tibbie, I hae seen the day, Ye…laser
(Encyclopedia) CE5 Ordinary light sources produce incoherent light, while a laser produces a beam of coherent light. laser [acronym for light amplification by stimulated emission of radiation],…fluorescence
(Encyclopedia) fluorescencefluorescencefl&oobreve;rĕsˈəns [key], luminescence in which light of a visible color is emitted from a substance under stimulation or excitation by light or other forms…Trending
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