The Fiber Optics Illustrated Dictionary - Part 46 fills a gap in the literature by providing instructors, hobbyists, and top-level engineers with an accessible, current reference. From the author of the best-selling Telecommunications Illustrated Dictionary, this comprehensive reference includes fundamental physics, basic technical information for fiber splicing, installation, maintenance, and repair, and follow-up information for communications and other professionals using fiber optic components. Well-balanced, well-researched, and extensively cross-referenced, it also includes hundreds of photographs, charts, and diagrams that clarify the more complex ideas and put simpler ideas into their applications context | Fiber Optics Illustrated Dictionary HEC See Header Error Control. hecto- symb. - h A Système Internationale SI unit prefix for 100 or 102. Heisenberg uncertainty principle Proposed by W. Heisenberg in 1927 the uncertainty principle has since become a fundamental principle of physics. Heisenberg formulated a model of the structure of an atom in the 1930s which has held up well over time. In studying movement of electronics Heisenberg proposed mathematically that it is not possible to determine precisely both the position and the velocity of a material particle at the same time. The uncertainty increases as the size of the particle decreases. Many researchers have generalized this principle and restated it in various broader contexts but most commonly it is brought up when describing the results of quantum experimental results. It is said that these are determined in part by the point of view and methods of the researcher. For example if light is studied as a particle phenomenon it appears to behave as a particle phenomenon. If it is studied as a wave phenomenon it appears to behave as a wave phenomenon at least as far as the observers and measuring instruments are concerned. In other words attempts to pin down precisely the location of an electron obscures its energy level and vice versa thus challenging the absolute nature of the world suggested by classical physics. Heisenberg Werner 1901 -1976 A German physicist responsible for deriving a theory of atomic structure and proposing the uncertainty principle in 1927 which has since become widely associated with his name. Heisenberg built on the work of previous physicists and mathematicians including Hermann Weyl. For his contributions he was awarded a Nobel prize in 1932. In the 1940s he acted as the director to the Kaiser Wilhelm Institute for Physics. Near the end of the second World War Heisenberg was captured by American troops and taken to Britain. When he returned to Germany he helped found the facility that .
