An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 639
  برقاتوانیک، برقاتوانا   
barqâtavânik, barqâtavânâ

Fr.: électrodynamique   

Referring to electrons in motion.

electro- + → dynamics.


Fr.: électrodynamique   

The phenomena, science, and applications of moving electric charges, as contrasted with → electrostatics. More specifically, the branch of physics concerned with the → interaction of → electric currents with → magnetic fields and → electric fields or with other electric currents.

electro- + → dynamics.

  آهنربا‌ی ِ برقی   
âhanrobâ-ye barqi (#)

Fr.: électroaimant   

A temporary magnet made by coiling wire around an → iron core. When current flows in the coil, or → solenoid, the iron becomes a → magnet. The electromagnet acts as a magnet only so long as the current is flowing in the solenoid.

electro-; → magnet.

  برقامغناتی، برقامغناطی   

Fr.: électromagnétique   

Of or pertaining to electromagnetism or electromagnetic fields.

electro- + → magnetic

electromagnetic field
  میدان ِ برقامغناتی   
meydân-e barqâmeqnâti

Fr.: champ électromagnétique   

A region of space consisting of coupled electric and magnetic lines of force at each point, generated by time-varying currents and accelerated charges.

electromagnetic; → field.

electromagnetic force
  نیروی ِ برقامغناتی   
niru-ye barqâmeqnâti

Fr.: force électromagnétique   

The fundamental force that is associated with electric and magnetic fields. One of the four fundamental forces of nature, it is carried by photons.

electromagnetic; → force.

electromagnetic induction
  درهازش ِ برقامغناتی   
darhâzeš-e barqâmeqnâti

Fr.: induction électromagnétique   

The production of an → electromotive force in a circuit caused by a variation in the magnetic flux through the circuit. If this variation is produced by a change in the current flowing in the circuit itself, it is called → self-induction. If due to the variation in a current in some other circuit, it is called mutual induction. See also → Faraday's law of induction.

electromagnetic; → induction.

electromagnetic potential
  توند ِ برقامغناتی   
tavand-e barqâmeqnâti

Fr.: potentiel électromagnétique   

The combination of both → electric scalar potential and → magnetic vector potential.

electromagnetic; → potential.

electromagnetic radiation
  تابش ِ برقامغناتی   
tâbeš-e barqâmeqnâti

Fr.: rayonnement électromagnétique   

Radiation propagating in the form of an advancing wave in electric and magnetic fields. It includes radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

electromagnetic; → radiation.

electromagnetic signal
  نشال ِ برقامغناتی   
nešâl-e barqâmeqnâti

Fr.: signal électromagnétique   

Information transmitted by means of a modulated current or an electromagnetic wave and received by telephone, radio, television, etc.

electromagnetic; → signal.

electromagnetic spectrum
  بیناب ِ برقامغناتی   
binâb-e barqâmeqnâti

Fr.: spectre électromagnétique   

The range of frequencies over which electromagnetic waves are propagated. → electromagnetic radiation.

electromagnetic; → spectrum.

electromagnetic theory
  نگره‌ی ِ برقامغناتی   
negare-ye barqâmeqnâti

Fr.: théorie électromagnétique   

The description of combined electric and magnetic fields mainly by → Maxwell's equations. Same as → electromagnetism.

electromagnetic; → theory.

electromagnetic theory of light
  نگره‌ی ِ برقامغناتی ِ نور   
negare-ye barqâmeqnâti-ye nur

Fr.: théorie électromagnétique de la lumière   

The theory describing light as a wave phenomenon resulting from the combination of two electric and magnetic fields vibrating transversely and mutually at right angles. → electromagnetic radiation; → electromagnetic wave; → Maxwell's equations.

electromagnetic; → theory; → light.

electromagnetic wave
  موج ِ برقامغناتی   
mowj-e barqâmeqnâti

Fr.: onde électromagnétique   

A wave produced by oscillation or acceleration of an electric charge. → electromagnetic radiation.

electromagnetic; → wave.

  برقامغنات، برقامغناتیس   
barqâmeghnât, barqâmeghnâtis

Fr.: électromagnétisme   

1) The science dealing with the physical relations between → electricity and → magnetism. Same as → electromagnetic theory.
2) One of the four fundamental forces of nature, governing the electric and magnetic interaction between particles.

electro-; → magnetism.

electromotive force (EMF)
  نیروی ِ برقران   
niru-ye barqrân (#)

Fr.: force électromotrice   

The force, analogous to a pressure, which maintains a flow of electricity through a closed circuit. It is the algebraic sum of the → potential differences acting in the circuit. The unit of electromotive force is the → volt.

From → electro- + motive, from M.E., from M.Fr., from O.Fr. motif, from M.L. motivus "moving, impelling," from L. motus, p.p. of movere "to move," → motion; → force.

Niru, → force; barqrân, literally "driving electricity," from barq, → electro- + rân present stem of rândan, → drive.

elektron (#)

Fr.: électron   

The → elementary particle that possesses the smallest possible negative → electric charge. This structureless particle has an intrinsic → spin (1/2), a mass of 9.109 382 91 (40) x 10-31 kg, and an electric charge of 1.602 176 565(35) × 10-19 → coulombs, or 4.803 204 51(10) × 10-10 → esu.

Term first suggested in 1891 by Irish physicist G. J. Stoney (1826-1911); from electr-, from → electric + -on, a suffix used in the names of subatomic particles, probably extracted from → ion.

electron capture
  گیر‌افت ِ الکترون   
giroft-e elektron

Fr.: capture d'électron   

A process whereby an → unstable atom becomes stable. In this process, an → electron in an atom's inner shell is drawn into the → nucleus where it combines with a → proton, forming a → neutron and a → neutrino. The neutrino escapes from the atom's nucleus. The result is an element change, because the atom loses a proton. For example, an atom of → carbon (with 6 protons) becomes an atom of → boron (with 5 protons). Electron capture is also called K-capture since the captured electron usually comes from the atom's K-shell. See also → neutronization.

electron; → capture.

electron charge
  بار ِ الکترون   
bâr-e elektron (#)

Fr.: charge de l'électron   

The charge of one electron, e = -1.602 176 × 10-19coulombs or -4.803 204 51 × 10-10statcoulombs.

electron; → charge.

electron configuration
  همپیکرش ِ الکترونی   
hampeykareš-e elektroni

Fr.: configuration électronique   

Of an atom, a form of notation which shows how the electrons are distributed among the various atomic orbital and energy levels. The format consists of a series of numbers, letters and superscripts. For example, 1s2 2s2 2p3 means: 2 electrons in the 1s subshell, 2 electrons in the 2s subshell, and 3 electrons in the 2p subshell.

electron; → configuration.

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