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Barn doors, or occasionally a set of barn doors, are an attachment fitted to the front of a Fresnel lantern, a type of lantern used in films, television, and theatres. The attachment has the appearance of a large set of barn doors, but in fact there are four leaves, two larger and widening on the outside, two smaller and getting narrower towards the outside.
Tithe barn in Jesteburg, Germany. A tithe barn was a type of barn used in much of northern Europe in the Middle Ages for storing rents and tithes. Farmers were required to give one-tenth of their produce to the established church. Tithe barns were usually associated with the village church or rectory, and independent farmers took their tithes ...
A barn (symbol: b) is a metric unit of area equal to 10 −28 m 2 (100 fm 2).Originally used in nuclear physics for expressing the cross sectional area of nuclei and nuclear reactions, today it is also used in all fields of high-energy physics to express the cross sections of any scattering process, and is best understood as a measure of the probability of interaction between small particles.
The ladder paradox (or barn-pole paradox) is a thought experiment in special relativity. It involves a ladder, parallel to the ground, travelling horizontally at relativistic speed (near the speed of light) and therefore undergoing a Lorentz length contraction. The ladder is imagined passing through the open front and rear doors of a garage or ...
The Doors. (album) The Doors is the debut studio album by the American rock band the Doors, released on January 4, 1967, by Elektra Records. It was recorded in August 1966 at Sunset Sound Recorders, in Hollywood, California, under the production of Paul A. Rothchild. The album features the extended version of the band's breakthrough single ...
The mass-to-charge ratio ( m / Q) is a physical quantity relating the mass (quantity of matter) and the electric charge of a given particle, expressed in units of kilograms per coulomb (kg/C). It is most widely used in the electrodynamics of charged particles, e.g. in electron optics and ion optics .
Panamanian President Jose Raul Mulino asked the U.S. to accelerate aid deliveries for repatriating migrants who cross into Panama through the dangerous Darien Gap, as part of the president's ...
Partial charge. In atomic physics, a partial charge (or net atomic charge) is a non- integer charge value when measured in elementary charge units. It is represented by the Greek lowercase delta (𝛿), namely 𝛿− or 𝛿+. Partial charges are created due to the asymmetric distribution of electrons in chemical bonds.