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photoelectric cell
(Encyclopedia) CE5 Photoelectric cell: Light causes a photosensitive surface to emit electrons, which flow as current to the positive terminal. A galvanometer measures the current and thus indicates light intensi...Sembene, Ousmane
(Encyclopedia)Sembene, Ousmane o͝osmäˈnĕ səmbĕˈnĕ [key], 1923–2007, Senegalese author and film director who wrote and made films in French and Wolof, often regarded as the father of sub-Saharan African ci...Tonga
(Encyclopedia)Tonga tŏngˈgə [key], officially Kingdom of Tonga, island kingdom (2015 est. pop. 106,000), 270 sq mi (699 sq km), South Pacific, c.2000 mi (3,220 km) NE of Sydney, Australia. Tonga is the only surv...Iran-Iraq War
(Encyclopedia)Iran-Iraq War, 1980–88, protracted military conflict between Iran and Iraq. It officially began on Sept. 22, 1980, with an Iraqi land and air invasion of western Iran, although Iraqi spokespersons m...Darrow, Clarence Seward
(Encyclopedia)Darrow, Clarence Seward, 1857–1938, American lawyer, b. Kinsman, Ohio. He first practiced law in Ashtabula, Ohio. In 1887 he moved to Chicago, where he was corporation counsel for several years and ...cosmic rays
(Encyclopedia)cosmic rays, charged particles moving at nearly the speed of light reaching the earth from outer space. Primary cosmic rays consist mostly of protons (nuclei of hydrogen atoms), some alpha particles (...erosion
(Encyclopedia)erosion ĭrōˈzhən [key], general term for the processes by which the surface of the earth is constantly being worn away. The principal agents are gravity, running water, near-shore waves, ice (most...Seattle
(Encyclopedia)Seattle sēătˈəl [key], city (2020 pop. 737,015), seat of King co., W Wash., built on seven ...Chirac, Jacques René
(Encyclopedia)Chirac, Jacques René zhäk rənāˈ shēräkˈ [key], 1932–2019, French political leader, president of France (1995–2007), b. Paris. He attended the National School of Administration, joined the ...Brandeis, Louis Dembitz
(Encyclopedia)Brandeis, Louis Dembitz brănˈdīs [key], 1856–1941, associate justice of the U.S. Supreme Court (1916–39), b. Louisville, Ky., grad. Harvard law school, 1877. As a successful Boston lawyer (1879...Browse by Subject
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