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Ritz, Walter

(Encyclopedia)Ritz, Walter, 1878–1909, Swiss physicist. He taught at the universities of Zürich and Göttingen. Ritz's combination principle, confirmed by later research, stated that the frequencies of spectral ...

electrode

(Encyclopedia)electrode, terminal through which electric current passes between metallic and nonmetallic parts of an electric circuit. In most familiar circuits current is carried by metallic conductors, but in som...

Shakti

(Encyclopedia)Shakti shŭkˈtē [key] [Skt.,=power], in Hinduism, name given to the female consorts of male deities. The Shakti personifies the dynamic, manifesting energy that creates the universe, while the male ...

bioluminescence

(Encyclopedia)bioluminescence bīˌōlo͞oˌmĭnĕsˈəns [key], production of light by living organisms. Organisms that are bioluminescent include certain fungi and bacteria that emit light continuously. The dinof...

black hole

(Encyclopedia)black hole, in astronomy, celestial object of such extremely intense gravity that it attracts everything near it and in some instances prevents everything, including light, from escaping. The term was...

Ann Arbor

(Encyclopedia)Ann Arbor, city (2020 pop. 123,851), seat of Washtenaw co., S Mich., on the Huron River; inc. 1851. It is a research and educational center, with a large number of government and industria...

Ibaraki

(Encyclopedia)Ibaraki ēbäˈräkē [key], prefecture, 2,352 sq mi (6,092 sq km), central Honshu, Japan. ...

Pennsylvania State University

(Encyclopedia)Pennsylvania State University, main campus at University Park, State College; land-grant and state supported; coeducational; chartered 1855, opened 1859 as Farmers' High School. It was named the Agric...

Papeete

(Encyclopedia)Papeete päpā-āˈtā [key], town (2007 pop. 26,017), capital of Tahiti and of French Polynesia, South Pacific. A port on the NW coast of Tahiti, Papeete ships copra, vanilla, and mother-of-pearl. Th...

weak interactions

(Encyclopedia)weak interactions, actions between elementary particles mediated, or carried, by W and Z particles and that are responsible for nuclear decay. Weak interactions are one of four fundamental interaction...