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wave equation hamugeš-e mowj Fr.: équation d'onde The partial differential equation ∂^{2}U / ∂^{2}x + ∂^{2}U / ∂^{2}y + ∂^{2}U / ∂^{2}z = (1/c^{2}) ∂^{2}U / ∂^{2}t or its counterparts in one or two dimensions or in other coordinates, the solution of which represents the propagation of displacementU as waves with velocity c. |
wave function karyâ-ye mowj Fr.: fonction d'onde In → quantum mechanics, the function of space and time that satisfies → Schrodinger equation. The square of the modulus of its amplitude at any point represents the probability of finding a particle there. → wave; → function. |
wave mechanics mekânik-e mowji (#) Fr.: mécanique ondulatoire One of the forms of quantum mechanics, due to Louis de Broglie and extended by E. Schrödinger. It originated in the suggestion that light consists of corpuscles as well as of waves and the consequent suggestion that all elementary particles are associated with waves. |
wave nature zâstâr-e mowji Fr.: nature ondulatoire A general term to describe → light involving the following phenomena: → reflection, → refraction, → interference, → diffraction, and → polarization. Compare → particle nature. |
wave number adad-e mowj (#) Fr.: nombre d'onde The reciprocal of → wavelength, which represents the number of waves per unit length. Wave number is often defined as k = 2π/λ. Same as → propagation number. |
wave optics nurik-e mowji Fr.: optique ondulatoire The branch of optics that analyzes the electromagnetic radiation in terms of its wave characteristics. Also called → physical optics. |
wave packet baste-ye mowj (#) Fr.: paquet d'onde A traveling → waveform consisting of the → superposition of several → waves of different → wavelengths and → phases. → wave; packet from M.E. pak "bundle" + diminutive suffix -et; maybe from M.Fr. pacquet. Basté "packet," literally "bound, tied; set," p.p. of bastan "to form, bind, tie" (Mid.Pers. bastan/vastan "to bind, shut;" Av./O.Pers. band- "to bind, fetter," banda- "band, tie;" cf. Skt. bandh- "to bind, tie, fasten;" Ger. binden; E. bind; PIE base *bhendh- "to bind"). |
wave plate tiqe-ye mowj (#) Fr.: lame à retard An optical element that retards the phase of one plane of vibration of light relative to the plane at right angles. The two beams then recombine to form a single beam with new polarization characteristics. A typical wave plate is a birefringent crystal with a carefully chosen orientation and thickness. Also known as → retardation plate. A → half-wave plate creates a half-wave retardation. See also → quarter-wave plate. |
wave theory of light negare-ye mowji-ye nur Fr.: théorie ondulatoire de la lumière The theory that describes light as waves that spread out from the source that generates the light. It contradicts the → corpuscular theory of light proposed by Newton (1704). The idea of the wave nature of light was first put forward by Robert Hooke (1660). The wave theory was originally stated by Huygens (1690), who showed reflection and refraction could be explained by this theory. It was supported by → Young's experiment (1802) and established by the work of Fresnel (1814-1815). The wave theory received its most important support from Maxwell's → electromagnetic theory. See also → Huygens-Fresnel principle. |
wave train qatâr-e mowj (#), mowj-teran Fr.: train d'onde A series of successive waves spaced at regular intervals. |
wave vector bordâr-e mowj (#) Fr.: vecteur d'onde A vector whose direction is that of propagation of a wave and whose magnitude is given by the → wave number, 2π/λ, where λ is the → wavelength, or ω/c, where ω is the → angular frequency and c is the speed of propagation. |
wave-particle duality dogânegi-ye mowj-zarré Fr.: dualité onde-particule The principle admitted in → quantum mechanics that
all particles have a wave-like nature and that waves have a particle aspect.
The wave-particle duality is of fundamental importance in obtaining a realistic picture of
the → elementary particles. |
waveband mowj-bând Fr.: bande de longueur d'onde A portion of the electromagnetic spectrum which is defined because of its characteristics or for its use. |
waveform mowjdis Fr.: forme d'onde A graphical representation of the shape of a wave for a given instant in time. |
waveform analysis ânâlas-e mowjdis Fr.: analyse de forme d'onde The resolution of a complex waveform into a sum of simple periodic waves, usually by computer means. |
wavefront pišân-e mowj, mowj-pišân Fr.: front d'onde The locus of adjacent points possessing the same phase in the path of a wave motion. Its surface is uniform (spherical or plane) and normal to propagation direction in an isotropic medium. → wavefront distortion. |
wavefront correction aršâyeš-e pišân-e mowj Fr.: correction de front d'onde In → adaptive optics, eliminating the effects of atmospheric turbulence on the wavefront of the object being observed. → wavefront distortion. → wavefront; → correction. |
wavefront distortion cowlegi-ye pišân-e mowj Fr.: distortion de front d'onde The disruption of the spherical shape of a wavefront due to atmospheric turbulence which makes the adjacent points in the wavefront out of phase. → wavefront; → distortion. |
wavefront sensor hessgar-e pišân-e mowj Fr.: analyseur de front d'onde In adaptive optics, a device that analyzes the light sample coming from the wavefront and determines the error in each part of the beam. The wavefront sensor used in adaptive optics is a → Shack-Hartmann type, which works in conjunction with a deformable mirror. |
wavefront tilt gerâ-ye pišân-e mowj Fr.: inclinaison du front d'onde The average slope in both the X and Y directions of a → wavefront or phase profile across the pupil of an optical system. |
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