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X WAVE [6 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2017-05-11

English

Subject field(s)
  • Electromagnetic Radiation
  • Optics
CONT

Both chlorophylls absorb light most strongly in the red and violet parts of the spectrum. Green light is absorbed poorly. Thus when white light shines on chlorophyll-containing structures like leaves, green light is transmitted and reflected and the structures appear green.

OBS

The light is made of particles(photons) but is also a wave. Its properties depend on its wavelength : longer waves are less energetic than shorter waves--photons with long wavelength have less energy than short-wavelength photons. Therefore, there are different kinds of electromagnetic radiation : infrared, radio waves, microwaves, gamma rays, X rays, etc. Only a small fraction can be detected by the human eye : the visible light--what in everyday-life is referred to simply as ’light’. The human eye cannot detect wavelengths larger [or shorter] than those of the visible light...

French

Domaine(s)
  • Rayonnements électromagnétiques
  • Optique
CONT

La lumière est susceptible de provoquer des réactions photochimiques qui sont à la base du processus de photosynthèse pour les plantes vertes. Mais l'efficacité lumineuse est différente pour l'œil et pour la photosynthèse; l'œil est en effet sensible à la lumière verte, proche du jaune, alors que les végétaux chlorophylliens, de par leur couleur, réfléchissent la plus grande partie de ces radiations et en absorbent peu. En fait les récepteurs biologiques de la lumière chez les différents êtres vivants ne captent pas les mêmes radiations; ils ne «voient» pas les mêmes lumières. La notion de lumière repose donc sur une base essentiellement anthropomorphique.

OBS

lumière : Rayonnement électromagnétique visible ou invisible constitué d'un flux de photons ou quanta d'énergie émis par les corps portés à haute température (incandescence) ou par les corps excités par diverses formes d'énergie (luminescence).

Spanish

Save record 1

Record 2 2017-05-11

English

Subject field(s)
  • Electromagnetic Radiation
  • Atmospheric Physics
DEF

An electromagnetic radiation in the wavelength range including infrared, visible, ultraviolet and x-ray and traveling in a vacuum with a speed of about 186,281 miles (300,000 kilometers) per second ...

CONT

The light is made of particles(photons) but is also a wave. Its properties depend on its wavelength : longer waves are less energetic than shorter waves--photons with long wavelength have less energy than short-wavelength photons. Therefore, there are different kinds of electromagnetic radiation : infrared, radio waves, microwaves, gamma rays, X rays, etc. Only a small fraction can be detected by the human eye : the visible light--what in everyday-life is referred to simply as ’light’. The human eye cannot detect wavelengths larger than those of the visible light, such as those of infrared light, microwaves(wavelengths of centimetres), or radio waves(wavelength sofmetres). Wavelengths shorter than visible light cannot be seen either : ultraviolet light, X-rays, gamma rays(the most energetic).

French

Domaine(s)
  • Rayonnements électromagnétiques
  • Physique de l'atmosphère
DEF

Rayonnement électromagnétique visible ou invisible constitué d'un flux de photons ou quanta d'énergie émis par les corps portés à haute température (incandescence) ou par les corps excités par diverses formes d'énergie (luminescence).

CONT

La lumière est susceptible de provoquer des réactions photochimiques qui sont à la base du processus de photosynthèse pour les plantes vertes. Mais l'efficacité lumineuse est différente pour l'œil et pour la photosynthèse; l'œil est en effet sensible à la lumière verte, proche du jaune, alors que les végétaux chlorophylliens, de par leur couleur, réfléchissent la plus grande partie de ces radiations et en absorbent peu. En fait les récepteurs biologiques de la lumière chez les différents êtres vivants ne captent pas les mêmes radiations; ils ne «voient» pas les mêmes lumières. La notion de lumière repose donc sur une base essentiellement anthropomorphique.

OBS

La lumière blanche comme celle du soleil, est une lumière complexe, que le prisme peut décomposer en une infinité de radiations où l'on distingue conventionnellement sept couleurs principales, allant du violet au rouge, selon leur longueur d'onde.

Spanish

Campo(s) temático(s)
  • Radiación electromagnética
  • Física de la atmósfera
DEF

Radiación electromagnética que corresponde al espectro visible y cuyas longitudes de onda están comprendidas entre 400 y 700 nm.

Save record 2

Record 3 2010-06-28

English

Subject field(s)
  • Radio Waves
DEF

One of the two components into which a sky wave is split in the ionosphere.

OBS

When viewed below the ionosphere in the direction of propagation, [the extraordinary wave] has clockwise or counterclockwise elliptical polarization, depending on whether the magnetic field of the earth has a positive or negative component in the same direction.

OBS

The extraordinary wave is designated by the letter X and is called the X-wave. The other component is the ordinary wave, or O-wave.

Key term(s)
  • X wave

French

Domaine(s)
  • Ondes radioélectriques

Spanish

Campo(s) temático(s)
  • Ondas radioeléctricas
Save record 3

Record 4 - external organization data 2009-07-30

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
06.01.92 (19762)
ISO/IEC standard entry number
DEF

polarization of a propagating wave is determined by the locus or path described by the electric field vector with respect to time

OBS

Polarization is a term that often arises in the literature and when considering radio frequency communication and RFID. If we ascribe an x, y, z co-ordinate system to a propagating wave as illustrated below, with the direction of propagation being in the z direction, the electric field vector E will be in the x, y plane. If E remains in the same orientation with respect to time, so that its locus describes a straight line, the wave is said to be linearly polarized. However, if the locus describes a circular motion with respect to time the wave is said to be circularly polarized. Where the locus describes an elliptical path, the wave is said to be elliptically polarized.

OBS

Circular polarization is often used in communication systems since the orientation of the transmitting and receiving antenna is less important than it is with linearly polarized waves. The magnetic vector, H, always remains perpendicular to the E vector. Using an IEEE convention, a clockwise circular rotating wavefront approaching a receiver is defined as being left-hand circular (LHC) polarized. The power in the wavefront is expressed in the form of the Poynting vector, P: P = (E x H) = E x H sin ..., where ... is the phase angle between E and H.

OBS

polarization summary: term and definition standardized by ISO/IEC [ISO/IEC 19762-4:2008].

French

Spanish

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Record 5 - external organization data 2005-07-15

English

Subject field(s)
  • Atomic Physics
  • Compartment - Canadian Nuclear Safety Commission
CONT

A gamma photon has more energy than most x ray photons, which in turn have more energy than ultra-violet photons and so on, down to the longest wave length radio waves.

Key term(s)
  • ultraviolet photon

French

Domaine(s)
  • Physique atomique
  • Tiroir - Commission canadienne de sûreté nucléaire
CONT

Un photon gamma possède plus d'énergie que la plupart des photons X, lesquels sont plus énergétiques que les photons ultraviolets, et ainsi de suite jusqu'aux ondes radio les plus longues.

Key term(s)
  • photon ultra-violet

Spanish

Save record 5

Record 6 - external organization data 2005-07-15

English

Subject field(s)
  • Atomic Physics
  • Compartment - Canadian Nuclear Safety Commission
CONT

A gamma photon has more energy than most x ray photons, which in turn have more energy than ultra-violet photons and so on, down to the longest wave length radio waves.

Key term(s)
  • x-ray photon

French

Domaine(s)
  • Physique atomique
  • Tiroir - Commission canadienne de sûreté nucléaire
CONT

Un photon gamma possède plus d'énergie que la plupart des photons X, lesquels sont plus énergétiques que les photons ultraviolets, et ainsi de suite jusqu'aux ondes radio les plus longues.

Spanish

Save record 6

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