scattering

/skat"euhr ing/, adj.
1. distributed or occurring here and there at irregular intervals; scattered.
2. straggling, as an assemblage of parts.
3. (of votes) cast in small numbers for various candidates.
4. distributing, dispersing, or separating.
n.
5. a small, scattered number or quantity.
6. Physics. the process in which a wave or beam of particles is diffused or deflected by collisions with particles of the medium that it traverses. Cf. elastic scattering, Rayleigh scattering.
[1300-50; ME; see SCATTER, -ING2, -ING1]

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In physics, the change in direction of motion of a particle because of a collision with another particle.

The collision can occur between two charged particles; it need not involve direct physical contact. Experiments show that the trajectory of the scattered particle is a hyperbola and that, as the bombarding particle is aimed more closely toward the scattering centre, the angle of deflection decreases. The term scattering is also used for the diffusion of electromagnetic waves by the atmosphere, resulting, for example, in long-range radio reception on the ground. See also Rayleigh scattering.

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 in physics, a change in the direction of motion of a particle because of a collision with another particle. As defined in physics, a collision can occur between particles that repel one another, such as two positive (or negative) ions, and need not involve direct physical contact of the particles. Experiments with subatomic particles indicate that the electric repulsive force between the particles satisfies Coulomb's law, which states that the force varies as the inverse square of the distance between the particles; i.e., if the distance is halved, the force is quadrupled. Experiments show, as in the Figure—>, that the trajectory of the scattered particle, whatever the angle of deflection, is a hyperbola and that as the bombarding particle is aimed more closely toward the scattering centre the angle of deflection increases.

      In probing the interior of the atom, the physicist Ernest Rutherford passed a stream of alpha particles through a thin sheet of gold foil. The alpha particles were emitted by a radioactive material and had enough energy to penetrate an atom; although most passed right through the gold foil, some were deflected in a way that indicated that the scattering was produced by a Coulomb force. Because the alpha particles are positively charged and the electrons in the atom are negatively charged, it followed that there must be a large positive charge inside the atom to create the Coulomb force by interacting with the alpha particles. In this way the nucleus of the atom was discovered.

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Universalium. 2010.

Look at other dictionaries:

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  • scattering — /ˈskatterin(g), ingl. ˈskætərɪŋ/ [vc. ingl., gerundio di to scatter «sparpagliare, disseminare»] s. m. inv. (fis.) deviazione, diffusione, sparpagliamento …   Sinonimi e Contrari. Terza edizione

  • scattering — [skat′ər iŋ] adj. 1. separating and going in various directions 2. distributed over a wide area, esp. at irregular intervals 3. distributed in small numbers among several or many candidates: said of votes n. 1. the act or process of one that… …   English World dictionary

  • scattering — [[t]skæ̱tərɪŋ[/t]] scatterings N COUNT: usu N of n A scattering of things or people is a small number of them spread over an area. ...the scattering of houses east of the village... Mr. James had had a scattering of very wealthy friends …   English dictionary

  • scattering — UK [ˈskætərɪŋ] / US noun [countable] Word forms scattering : singular scattering plural scatterings a small number of people or things that are spread over a large area The village was just a scattering of houses along the river …   English dictionary

  • scattering — I. noun Date: 14th century 1. an act or process in which something scatters or is scattered 2. something scattered: as a. a small number or quantity interspersed here and there < a scattering of visitors > b. the random change in direction of the …   New Collegiate Dictionary

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