1) Subdivision of an interval in a scale of measurement.
From O.Fr. degré, from V.L. *degradus "a step," from L.L. degredare, from L. → de- "down" + gradus "step."
Darajé, from Ar. darajat "step, ladder."
degree of coherence
Fr.: degré de cohérence
The extent of → coherence of an → electromagnetic wave, as indicated by a → dimensionless number. Since interference takes place when waves are → coherent, using a → Young's experiment, the degree of coherence is measured from the → fringe → visibility, V. It is defined as the ratio V = (Imax - Imin) / (Imax + Imin), where Imax is the intensity at a maximum of the → interference pattern, and Imin is the intensity at a minimum of the interference pattern. The electromagnetic wave is considered to be highly coherent when the degree of coherence is about 1, incoherent for nearly zero values, and partially coherent for values between 0 and 1.
degree of freedom
daraje-ye âzâdi (#)
Fr.: degré de liberté
Of a → mechanical system, the number of → independent variables needed to describe its configuration.
degree of ionization
daraje-ye yoneš (#)
Fr.: degré d'ionisation
The number of electrons a neutral atom has lost in an ionizing physical process (radiation, shock, collision). In spectroscopy, the degree of ionization is indicated by a Roman numeral following the symbol for the element. A neutral atom is indicated by the Roman numeral I, a singly ionized atom, one which has lost one electron, is indicated by II, and so on. Thus O VI indicates an oxygen atom which has lost five electrons.
→ degree; → ionization.
degree of polarization
Fr.: degré de polarisation
The ratio of the intensity of polarized portion of light to the total intensity at a point in the beam.
→ degree; → polarization.
degree of stability
Fr.: degré de stabilité
Statics: The → energy that must be expended to permanently disturb a specific state of → equilibrium of a body.
degree of vertex
Fr.: degré de vertex
The → number of → edges incident on the → vertex.
first degree equation
hamugeš-e daraje-ye yekom
Fr.: équiation du premier degré
A equation in which the highest → exponent of the → variable is 1. Same as → linear equation.
daraje-ye qotbeš (#)
Fr.: degrÃ© de polarisation
→ polarization; → degree.
Fr.: degré carré
A solid angle whose cone is a tetrahedral pyramid with an angle between its edges equal to 1°. 1 square degree = 3.046 x 10-4 sr = 2.424 x 10-5 solid angle of a complete sphere.