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Perfect fifth
In music theory, a perfect fifth is the musical interval corresponding to a pair of pitches with a frequency ratio of 3:2, or very nearly so.Perfect fifth Equal tempered Justperfect fifthInverseper
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Sector light
A sector light is a man-made pilotage and position fixing aid that consists of strictly delineated horizontal angle light beams to guide water-borne traffic through a safe channel at night in reaso
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Ludwig Meyer
Ludwig Meyer (27 December 1827 – 8 February 1900) was a German psychiatrist born in Bielefeld.Ludwig MeyerIn 1852 he obtained his medical doctorate from the University of Berlin, afterwards working
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Gauge theory
This article includes a list of general references, but it lacks sufficient corresponding inline citations.Please help to improve this article by introducing more precise citations. (September 2016
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Pilsum Lighthouse
Pilsum Lighthouse (German: Pilsumer Leuchtturm) was built in 1891 as a sector light for the Emshörn channel on Germany's North Sea coast. It is located on a dyke near the village of Pilsum in the
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Quantum field
In theoretical physics, quantum field theory (QFT) is a theoretical framework that combines field theory and the principle of relativity with ideas behind quantum mechanics.: xi QFT is used in part
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Otto Waalkes
This biography of a living person needs additional citations for verification.Please help by adding reliable sources. Contentious material about living persons that is unsourced or poorly sourced m
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Pajaro Valley
The Pajaro River (pájaro is bird in Spanish) is a U.S. river in the Central Coast region of California, forming part of the border between San Benito and Santa Clara Counties, the entire border bet
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Westerheversand Lighthouse
The Westerheversand Lighthouse (German: Leuchtturm Westerheversand) is located in Westerhever, Schleswig-Holstein, Germany. Considered to be one of the best-known lighthouses in northern Germany, i
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Exotic matter
There are several proposed types of exotic matter: Hypothetical particles and states of matter that have not yet been encountered, but whose properties would be within the realm of mainstream physi
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