The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed or studied either as spread out on a screen, by direct vision, by photography, or otherwise. See Illust. of Light, and Spectroscope.
A luminous appearance, or an image seen after the eye has been exposed to an intense light or a strongly illuminated object. When the object is colored, the image appears of the complementary color, as a green image seen after viewing a red wafer lying on white paper. Called also ocular spectrum.
A wavelength or frequency band of electromagnetic radiation that contains information about the radiating source of energy. Optical astronomers rely on the spectrum of light from red to blue (visible spectrum) for detailed information carried by absorption or emission lines, color appearance and brightness. An optical instrument called a spectrograph refracts the light into a spectrum of color with a grating or prism.
The distribution of some physical property, arranged in numerical order. One example is white light split by a prism. The resulting spectrum is arranged in order of increasing wavelength from violet, with the shortest wavelength, to red, with the longest.
The full range of frequencies available for use. (Different electronic devices operate at different frequencies on the electromagnetic spectrum.)
Spatial arrangement of components of radiant energy in order of their wavelengths, wave number or frequency.
plural: spectra Function of spreading energy within an optical range of wave length. The visible light lies in the spectrum range between 380nm - 780nm. Infrared light has a longer wave length, ultraviolett light has a shorter wave length.
Most often used in the context of frequency allocations. Refers to the frequencies allowed for a type of service out of the total available.
Refers to a particular band of frequencies. The normal acoustic sound spectrum is the range of human auditory perception (20 Hz to 20,000 Hz). There is also a Subsonic spectrum (considered to be below about 40 Hz) and an Ultrasonic audio spectrum (above 20,000 Hz).
A range of components, arranged in order. For example, the spectrum of electromagnetic radiation is the array of wavelengths composing it.
the range of wavelengths and frequencies making up light; the wavelengths are separated when a beam of white light passes through a prism.
Composite of white light, which are the colors of the human eye can see. The spectrum is composed of the colors red, orange, yellow, green, blue, indigo, and violet in that order.
Light that has been spread out into its component colors or wavelengths. Electromagnetic radiation that has been spread out into a spectrum allows an observer to study its individual colors or wavelengths. A rainbow is an example of the visible spectrum. Astronomers use spectra to study absorption and emission lines and their relative brightness to learn about the temperature, composition, speed, and distance of celestial objects. Spectra of such objects often provide very detailed information about them. To obtain spectra, astronomers use instruments called spectrographs on their telescopes. Spectrograph use diffraction gratings or prisms to refract the light into a spectrum of color.
a plot of the intensity of light at different frequencies. (See examples of spectra in Spectral Line Graphs.)
A range of electromagnetic frequencies.
The range of colors that comprise a light source.
All the colors of the rainbow created by passing sunlight or white light through a prism. See visible spectrum; white light.
The representation of frequency components of a signal waveform showing amplitude, and less commonly, phase relationships.
the unique set of colors of light emitted by an atom or a compound when it absorbs energy, such as from light, heat, or electricity.
A band of light of various colors, similar to a rainbow, produced by passing light through a prism or other optically dispersive instrument.
the distribution of wavelengths or frequencies of electromagnetic radiation.
The wavelengths (colour) of light.
refers to a band of frequencies where wireless signals travel carrying voice and data information.
Refers to the visible bands colors or all the colors of the rainbow which are contained in white light.
An array of the components of radiation separated in order of some varying property such as wavelength
(pl. spectra) A rainbow or band of different colors made when light is broken up into wavelengths.
The entire range of electromagnetic radiation, from gamma rays to radio waves.
The range of electromagnetic radiation (electromagnetic waves) in our known universe, which includes visible light. The radio spectrum, which includes both licensed and unlicensed frequencies up to 300GHz has been defined worldwide in three regions: Europe and Northern Asia (Region 1); North and South America (Region 2), and Southern Asia and Australia (Region 3). Some frequency bands are used for the same purpose in all three regions while others differ. Frequencies above 40GHz have not been licensed, but are expected to be made available in the future as the technology is developed to transmit at these smaller wavelengths (higher frequencies). The spectrum can be viewed in meticulous detail from the Federal Communications Commission (FCC) and National Telecommunications and Information Administration (NTIA) by visiting www.fcc.gov/oet/spectrum and www.ntia.doc.gov/osmhome/osmhome.html.
The result of breaking up light into its various wavelengths. In the visual regime, we see this as a display of the "rainbow" of colors. A prism is a good tool to use to see the spectrum of colors. See also dispersion, static electricity
A loosely-defined wide range of frequencies. See also Band.
spreading out of the energy of a radiating source into its component wavelengths by means of a prism, grating, or other dispersing device.
display of the intensity of light at different wavelengths or frequencies.
(solar) A measure of the sun's energy over different wavelengths. The sun emits maximum energy at about 0.45 microns, whereas silicon PV cells are most efficient at 1.1 microns.
Originally the spread of light of different frequencies by a prism. Later, the same spread of frequencies by mathematical analysis of a time series, usually using Fourier Analysis especially FFT.
In a diagnosis study, the range of clinical presentations and of relevant disease advancement exhibited by the subjects included in the study.
The spectrum of a sound wave is the distribution in frequency of the magnitudes (and sometimes the phases) of the components of the wave
broad range of related values or qualities or ideas or activities
a band of colors produced when sunlight is passed through a prism
a definition of the magnitude of the frequency components that constitute a quantity
a display of the intensity of light emitted at each wavelength
a graphical representation of this energy, in which each wavelength is shown separately
a graph of how much energy is emitted at each wavelength (different wavelengths correspond to different energy, or "colors")
a graph of the intensity of light versus its energy or wavelength
a graph that shows how strongly an object reflects or emits different wavelengths of light
a plot of absorbance (or transmittance) versus wavelength, frequency, or wavenumber
a plot that records the intensity at each wavelength
a range of frequencies and these are split into bands, and then into channels
The component frequencies that make up a wave. The visible part of the sun’s spectrum can be seen in a rainbow.
The amount of energy given off by an object at measured energies (plural, spectra)
a plot of energy versus frequency or wavelength of light
The entire range of the electromagnetic waves from the long wavelength sound waves, to the infared, to visible light, to ultraviolet, to X-Rays.
The array of colors or wavelengths obtained when light (or other radiation) from a source is dispersed, as in passing it through a prism or grating.
Visible and invisible colors of the rainbow formed when light is split into its parts.
The range of colors visible when white light is passed through a prism. The prism divides the white light into wavelengths from short to long.
the series of colored bands dispersed and arranged in the order of their respective wavelengths by the passage of white light through a prism. The six main colors of the spectrum are red, orange, yellow, green, blue, and violet.
A series of radiated energies arranged in order of wavelength. The radio spectrum extends from 20 kilohertz upward.
A plot of the distribution of variance with frequency.
the complete range of color presented in a beam of light
A method of representing the distribution of wave energy as a function of frequency.
The band of individual colors that results when a beam of white light is broken into its component wavelengths, identifiable as hues.
The array of colors or wavelengths that appears when light from an object is dispersed
shows the frequency distribution for the entire wave or segment, with intensity (in dB) on the vertical axis and frequency on the horizontal axis. It is often referred to as a power spectrum.
The band of colours or lines produced when light or other electromagnetic radiations are separated into their component wavelengths.
ËˆspÉ›ktÉ¹É™m] - the set of simple waves that a complex wave is composed of.
Relating to any transmissions or reception of electromagnetic waves.
Separation of light into its component wavelengths.
A range of frequencies available for over-the-air transmission.
This encompasses the entire range of electromagnetic waves from below one Hz to over 3 x 1020 Hz.
The description of a sound wave's components of frequency and amplitude.
Electromagnetic radiation whose beam is dispersed like a natural rainbow so that components with different wavelengths are separated in space in order of increasing or decreasing wavelength. There are three kinds of spectra that interest astronomers. Continuous spectra: The surface of a star is heated to such an extent that it glows with a particular colour. Red for cool stars, bluish-white for very hot stars. Because the light emitted at the surface has been absorbed and transmitted by many atoms by the time it reaches the surface, the discrete colours of the emission spectra of the atoms have been evened out to form a continuous spectra. Absorption Spectra: See Line (absorption). Emission Spectra: These usually arise from gas that is in the outer regions of stars, where the light is not absorbed and emitted many times before being transmitted to space. An emission spectrum consists of sharp peaks in the spectrum corresponding to the wavelengths of the emitted light.
Used to describe the wavelengths of light produced by a bulb.
The comprehensive range of colors in visible light.
a plot of the intensity of light at different frequencies or wavelengths
The colors that are the result of a beam of white light that is broken by a form of prism into its hues.
In electromagnetics, spectrum refers to the description of a signal’s amplitude versus its frequency components. In optics, spectrum refers to the light frequencies composing the white light which can be seen as rainbow colors.
(pl. spectra) An arrangement of electromagnetic radiation according to wavelength.
or visible spectrum Band of electromagnetic radiation ranging from wavelengths of approximately 400 to approximately 700 nanometers, corresponding to the sensitivity of the human eye. Sensitivity does not drop to zero at the standard endpoints of the visible spectrum, but is so low that light outside these limits rarely has a significant effect on visual response. Many non-human animals respond significantly to light outside this range, especially to light of shorter wavelengths.
The range of electromagnetic radio frequencies used in the transmission of sound, data and television.
A complete range.
In the original meaning, the spread of colors seen in the rainbow, covering all pure colors the eye can see. Spectrum of a substance, e.g. of an atomic element, is the collection of spectral lines emitted by it.
Electromagnetic radiation displayed or visualized as a function of wavelength. Thus, the rainbow is part of the spectrum of sunlight.
A continuous band of frequencies...
A particular distribution of wavelengths and frequencies.
The pattern of colours produced when the light from an object is passed through a prism or diffraction grating.
The result of spreading a beam of electromagnetic radiation so that components with different wavelengths are separated.
The composition of a sound expressed in frequency and amplitude.
The complete range of colors in the rainbow, from short wavelengths (blue) to long wavelengths (red)
The distribution of power versus frequency in an electromagnetic wave. See also Spectrum Signature Analysis and illustrations under Sideband.
Range of radiant energy within which the visible spectrum-with wavelengths of from 400 to 700 mm exists.
The entire range of frequencies in existence from zero to infinity.
A specific frequency range.
A spectrum is a continuous range of values (most often frequencies), from the lowest known to the highest known.
1. The frequency components that make up complex waveform. The band of frequencies necessary for transmission of a given type of intelligence. 2. The range of frequencies considered in a system.
A term used to describe a range of frequencies for a specific application.
1. the energy emitted by a radiant source 2. the entire range of electromagnetic radiation (light)
result of spreading out light by wavelengths. A rainbow is a natural spectrum. The eye is sensitive to waves from violet at 380 nm wavelength to red at 700 nm wavelength, but astronomers now study electromagnetic radiation from gamma rays through X-rays, ultraviolet, violet, blue, green, yellow, orange, red, infrared and radio waves.
Light from any source that has been separated into its different colors, using a prism or other refractive device. A rainbow is a naturally occurring spectrum of sunlight. The plural of spectrum is spectra. Use the "back" button to return to the lesson.
a means of charting the order of radio and television signals in terms of their physical wavelength. A continuous range of frequencies in the earth's atmosphere.
a continuum of color formed when a beam of white light is dispersed (as by passage through a prism) so that its component wavelengths are arranged in order. All forms of electromagnetic radiation can be dispersed to form a spectrum.
Frequencies that exists in a continuous range & have a common characteristic. A spectrum may be inclusive of many spectrums.
In gamma ray spectrometry, the continuous range of energy over which gamma rays are measured. In time-domain electromagnetic surveys, the spectrum is the energy of the pulse distributed across an equivalent, continuous range of frequencies.
the array of colors or frequencies obtained by dispersing light, as through a prism; often banded with absorption or emission lines.
(1) In physics, any series of energies arranged according to wavelength (or frequency); (2) The series of images produced when a beam of radiant energy is subject to dispersion. A rainbow-coloured band of light is formed when white light is passed through a prism or a diffraction grating. This band of colours results from the fact that the different wavelengths of light are bent in varying degrees by the dispersing medium and is evidence of the fact that white light is composed of coloured light of various wavelengths. SPOT Satellite Pour l'Observation de la Terre. A French satellite carrying two pushbroom imaging systems. (Originally Système Probatoire de l'Observation de la Terre).
The distribution of energy emitted by a radiant source, as by an incandescent body, arranged in order of wavelengths such as radio, x-ray, light and gamma ray waves.
A series of radiation wavelengths sequentially arranged.
A display produced by the separation of a complex radiation into its component wavelengths or energies so that all wavelengths can be observed simultaneously.
The resolving of overall vibration into amplitude components as a function of frequency.
the colored band of light made when white light passes through a prism.
The range of wavelengths of electromagnetic radiation.
A sequence of colors produced by passing light through a prism or diffraction grating. A range of wavelengths of electromagnetic radiation. A plot that shows how some intensity-related property of a beam of radiation or particles depends on another property that is related to dispersal of the beam by a prism, a magnet, or some other device. For example, a plot of light absorbance vs. wavelength is an absorption spectrum; a plot of ion abundance vs. mass is a mass spectrum.
an array of the components of an emission or wave separated and arranged in the order of some varying characteristic (as wavelength, mass, or energy) (such as the light spectrum).
refers to radio-frequency hertzian waves used as a transmission medium for cellular radio, radiopaging, satellite communication, over-the-air broadcasting and other services.
The spectrum is the band of colors that white light is composed of, in the order: red, orange, yellow, green, blue, indigo, violet (from long to short wavelength). Newton first discovered that sunlight could be divided into the visible spectrum.
The distribution of light (or electromagnetic radiation in general) over its constituent wavelengths. For example, a rainbow shows a spectrum of the visible light from the Sun.
A curve showing amplitude and phase as a function of frequency or period, or how much of each type of shaking there is from an earthquake.
the distribution of energy emitted by a radiant source, as by an incandescent body, arranged in order of wavelengths. Often seen as a rainbow effect of coloured light.
the rainbow of colors of light that make up the white light of the sun. The spectrum may be seen by passing the sun's light through a prism.
The complete range of colours in the rainbow, from short wavelength (blue) to long wavelengths (red).
The entire range of electromagnetic frequencies.
The band of colours formed when a beam of white light passes through a prism or by some other means (e.g. mist or spray, in the case of a rainbow) The full range of spectrum colours are: red, orange, yellow, green blue, indigo, and violet.
A band or range of frequencies; the audible spectrum runs from 20 Hz to 20,000 Hz (20 kHz).
Display of component wavelengths (colours) of electromagnetic radiation.
The band of colors that is formed when white light passes through a prism or is broken apart by some other means.
Electromagnetic radiation arranged in order of wavelength. A rainbow is a natural spectrum of visible light from the Sun. Spectra are often punctuated with emission or absorption lines, which can be examined to reveal the composition and motion of the radiating source.
Collection of waves with different wavelengths and amplitudes.
Spatial arrangement of electromagnetic energy in order of wavelength size. See Electromagnetic Spectrum, Visible Spectrum.
A series of similar waves, arranged in order of wavelength or frequency. Waves
espectro] the electromagnetic spectrum, of which visible light is a small part. Also includes X-rays to radio waves. Can also refer to a spectral scan, which shows the absorbance or transmittance of a chemical in respect to a specified range of wavelengths of light.
The the entire range electromagnetic frequencies.
the distribution of the light intensities to the different wavelengths. Actually, the spectrum of any source is a luminous strip of different colours, obtained when the radiation of the source is made go through a prism or another object; the prism resolves the light into the different wavelengths that compose it. The spectrum of a stellar source has dark lines, called absorption lines, while other sources have lines of emission aswell, more brilliant than the rest of the spectrum. The spectral lines provide indications on the chemical composition and on the temperature of the source.
The name given to a range of frequencies used by a wireless carrier to provide service and measured in hertz.
A series of coloured bands of light diffracted and arranged in order of their wavelength--red, orange, yellow, green, blue, violet. A rainbow is an example of a spectrum.
The array of colors or wavelengths obtained when light is dispersed, as by a prism; the amount of energy given off by an object at every different wavelength.
The visible separation of light into colored bands as white light passes through a prism.
The spatial arrangement of electromagnetic energy in accordance to size of wavelength.
See Frequency Spectrum.
The distribution of wavelengths and frequencies.
A band of colors which forms when visible light passes through a prism. The band ranges in color from violet (shorter wavelength) to red (longer wavelength).
The complete range of electromagnetic waves that can be transmitted by natural sources such as the sun, and man-made radio devices. Electromagnetic waves vary in length and therefore have different characteristics. Longer waves in the low-frequency range can be used for communications, while shorter waves of high frequency show up as light. Spectrum with even shorter wavelengths and higher frequencies are used in X rays.
The array of colors arranged by their wavelengths. Red, orange, yellow, green, blue, indigo, violet.
The result of the separation of white light into its component light waves.
Refers to an absolute range of frequencies. For example, the spectrum of CATV cable is about 5 Hz to 400 MHz
Federal government designation of a range of frequencies for a category of use or uses. For example, the Federal Communications Commission (FCC) allocated the 1900 MHz band for personal communications services.
The electromagnetic radio spectrum. The FCC grants authorizations and licenses to private and governmental entities to use specified portions under certain conditions.
The complete range of colors, from blue (short wavelengths) to red (long wavelengths).
The complete range of colors in light in a rainbow, from short wavelengths (ultraviolet) to long wavelengths (infrared) red.
Arrangement or display of light or other forms of electromagnetic radiation separated according to wavelength, energy or some other property.
A range of frequencies measured in hertz used by a wireless carriers or other services.
The band of colors that forms when white light is passed through a prism.