first oscillation
91Klystron — A klystron is a specialized linear beam vacuum tube (evacuated electron tube). Klystrons are used as amplifiers at microwave and radio frequencies to produce both low power reference signals for superheterodyne radar receivers and to produce high …
92laser — /lay zeuhr/, n. Physics. a device that produces a nearly parallel, nearly monochromatic, and coherent beam of light by exciting atoms to a higher energy level and causing them to radiate their energy in phase. Also called optical maser. [1955 60; …
93Double fold (paper testing) — How a double fold is made using a test piece (seen from the side) …
94North Atlantic tropical cyclone — Tracks of Atlantic tropical cyclones (1851 2005) North Atlantic tropical cyclones usually form in the northern hemisphere summer or fall. Tropical cyclones can be categorized by intensity. Tropical storms have one minute maximum sustained winds… …
95Lee De Forest — Infobox person name = Lee De Forest caption = birth date = birth date|1873|8|26|mf=y birth place = Council Bluffs, Iowa death date = death date and age|1961|6|30|1873|8|26|mf=y death place = Hollywood, Los Angeles, California occupation =… …
962004 Indian Ocean earthquake and tsunami — 2004 Indian Ocean earthquake Tsunami strikes Ao Nang, Thailand. Date 00:58:53, December 26 …
97Tacoma Narrows Bridge (1940) — This article is about the first Tacoma Narrows Bridge, which collapsed in 1940. For the article on the current bridges, see Tacoma Narrows Bridge. Tacoma Narrows Bridge The original Tacoma Narrows Bridge roadway twisted and vibrated violently… …
98Wave — A wave is a disturbance that propagates through space and time, usually with transference of energy. While a mechanical wave exists in a medium (which on deformation is capable of producing elastic restoring forces), waves of electromagnetic… …
99Gyroscope — A gyroscope is a device for measuring or maintaining orientation, based on the principles of angular momentum [ [http://demonstrations.wolfram.com/Gyroscope/ Gyroscope] by Sándor Kabai, The Wolfram Demonstrations Project.] [… …
100Pacific Ocean — an ocean bordered by the American continents, Asia, and Australia: largest ocean in the world; divided by the equator into the North Pacific and the South Pacific. 70,000,000 sq. mi. (181,300,000 sq. km); greatest known depth, 35,433 ft. (10,800… …
