spectrum

(redirected from medium frequency)
Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia, Wikipedia.

spectrum

 [spek´trum] (L.)
1. the series of images resulting from the refraction of electromagnetic radiation (e.g., light, x-rays) and their arrangement according to frequency or wavelength.
2. range of activity, as of an antibiotic, or of manifestations, as of a disease. adj., adj spec´tral.
absorption spectrum one obtained by passing radiation with a continuous spectrum through a selectively absorbing medium.
broad-spectrum effective against a wide range of microorganisms.
visible spectrum that portion of the range of wavelengths of electromagnetic vibrations (from 770 to 390 nanometers) which is capable of stimulating specialized sense organs and is perceptible as light.

spec·trum

, pl.

spec·tra

,

spec·trums

(spek'trŭm, -ă, -ŭmz),
1. The range of colors presented when white light is resolved into its constituent colors by being passed through a prism or through a diffraction grating: red, orange, yellow, green, blue, indigo, and violet, arranged in increasing frequency of vibration or decreasing wavelength.
2. Figuratively, the range of pathogenic microorganisms against which an antibiotic or other antibacterial agent is active.
3. The plot of intensity versus wavelength of light emitted or absorbed by a substance, usually characteristic of the substance and used in qualitative and quantitative analysis.
4. The range of wavelengths presented when a beam of radiant energy is subjected to dispersion and focused.
[L. an image, fr. specio, to look at]

spectrum

(spĕk′trəm)
n. pl. spec·tra (-trə) or spec·trums
1. Physics
a. The entire range over which some measurable property of a physical system or phenomenon can vary, such as the frequency of sound, the wavelength of electromagnetic radiation, or the mass of specific kinds of particles.
b. A specific portion of such a range: the infrared spectrum.
c. A characteristic distribution of phenomena manifested over such a range: the emission spectrum for sodium vapor.
d. A graphic representation of such a distribution; a spectrogram.
e. A band of colors produced when the wavelengths making up white light are separated, as when light passes through a prism or strikes drops of water.
2.
a. A range of values of a quantity or set of related quantities: the income spectrum.
b. A sequence or range of related qualities, ideas, activities, entities, or phenomena: the whole spectrum of 20th-century thought; the spectrum of genes involved in the immune response.

spec·trum

, pl. spectrums, spectra (spek'trŭm, -trŭmz, -tră)
1. The range of colors presented when white light is resolved into its constituent colors by being passed through a prism or through a diffraction grating: red, orange, yellow, green, blue, indigo, and violet, arranged in increasing frequency of vibration or decreasing wavelength.
2. The range of pathogenic microorganisms against which an antibiotic or other antibacterial agent is active.
3. The plot of intensity versus wavelength of light emitted or absorbed by a substance, usually characteristic of the substance and used in qualitative and quantitative analysis.
4. The range of wavelengths presented when a beam of radiant energy is subjected to dispersion and focused.
[L. an image, fr. specio, to look at]

spectrum 

1. Spatial display of a complex radiation produced by separation of its monochromatic components.
2. Composition of a complex radiation, e.g. continuous spectrum, line spectrum (CIE). Plural: spectra. See light.
absorption spectrum The curve representing the relative absorption of a pigment or chemical substance as a function of the wavelength of light. Example: the absorption spectrum of rhodopsin. Syn. absorbance spectrum.
action spectrum A graphical representation of the relative energy necessary to produce a constant biological effect. Example: frequency of action potentials in a ganglion cell as a function of wavelength.
continuous spectrum A spectrum in which, over a considerable range, all wavelengths exist without any abrupt variation in intensity. Example: the spectrum of hot solids. See filament lamp.
electromagnetic spectrum The total range of all electromagnetic waves. It extends from the longest radio waves of some thousands of metres in wavelength through radar, microwave, infrared rays, visible rays (between wavelengths 780nm and 380nm) to ultraviolet rays, X-rays, gamma rays and cosmic rays with wavelengths as short as 8 ✕ 10−12mm. All these electromagnetic waves differ only in frequency (and wavelength) but have the same speed as light in a vacuum.
equal energy spectrum Spectrum in which all wavelengths have about the same amount of energy. See achromatic; white light.
fortification spectrum See scintillating scotoma.
invisible spectrum The portions of the entire electromagnetic spectrum that are made up of radiations other than those of the visible spectrum.
line spectrum Spectrum consisting of a series of discrete monochromatic lines (or narrow bands of monochromatic light) with large intensity differences and separated by intervals without radiations. Example: the spectrum emitted by an electric discharge through a gas or vapour under low pressure.
spectrum locus The representation of the spectral colour stimuli on a chromaticity diagram.
solar spectrum The spectrum formed by sunlight. It is crossed at intervals by Fraunhofer's lines.
visible spectrum The portion of the electromagnetic spectrum that can be perceived by the visual system. It is composed of radiations of wavelengths in the range between 380nm and 780nm in younger eyes. This range decreases with age especially due to lens absorption of short wavelengths becoming closer to 420nm than 380nm. See light.

Table S4 Approximate values of the velocity, frequency and wavelength of electromagnetic radiations in a vacuum (the values represent a point within a range of radiations)
wavelength
radiationvelocity (m/s)frequency (Hz)(m)(nm)
AM radio3 ✕ 108 1 ✕ 106 3 ✕ 1023 ✕ 1011
television3 ✕ 108 1 ✕ 108 33 ✕ 109
radar3 ✕ 108 1 ✕ 109 3 ✕ 10−13 ✕ 108
microwave3 ✕ 108 1 ✕ 1010 3 ✕ 10−23 ✕ 107
thermal infrared3 ✕ 108 1 ✕ 1013 3 ✕ 10−53 ✕ 104
near infrared3 ✕ 108 1 ✕ 1014 3 ✕ 10−63000
light
red3 ✕ 1083.94 ✕ 10147.6 ✕ 10−7760
yellow3 ✕ 1085.45 ✕ 10145.5 ✕ 10−7550
violet3 ✕ 1087.50 ✕ 10144.0 ✕ 10−7400
ultraviolet3 ✕ 108 1 ✕ 1016 3 ✕ 10−830
X-rays3 ✕ 108 1 ✕ 1018 3 ✕ 10−100.3
gamma rays3 ✕ 108 1 ✕ 1021 3 ✕ 10−130.0003

spec·trum

, pl. spectrums, pl. spectra (spek'trŭm, -trŭmz, -tră)
1. Range of colors presented when white light is resolved into its constituent colors by being passed through a prism or through a diffraction grating: red, orange, yellow, green, blue, indigo, and violet.
2. Range of pathogenic microorganisms against which an antibiotic or other antibacterial agent is active.
[L. an image, fr. specio, to look at]

Patient discussion about spectrum

Q. What is the difference between autism, and autism spectrum? Doctor states my child is autistic, school says he has autism spectrum disorder. What is the difference? Can medication help with any of this?

A. i agree with Lilian- it's just a way for schools to keep their behinds clean...

Q. What is a "spectrum disorder" mean? I just heard/read about spectrum disorder, What is a "spectrum disorder" mean?

A. Autism is a spectrum disorder where symptoms and characteristics can present themselves in a wide variety of combinations, from mild to severe and in any combination. A high functioning individual with autism might simply seem eccentric, a loner. More severely affected individuals may hardly communicate and prefer to function primarily in "their own world". Most individuals fall in the middle of the spectrum.

Q. What shall I do with my 3 years old son with autism spectrum disorder. What shall I do with my 3 years old son with autism spectrum disorder to increase on his Sensory Integration. I feel therapy is too costly to afford….Is there any alternative.

A. there are some computer software that can do that too, and it doesn't cost all that much.they combine hearing- seeing and feeling.
i saw a computer USB contraption that also work int hat method and i think it costs 150-200 $ ...not sure....

More discussions about spectrum
References in periodicals archive ?
In the final analysis, total energy cost per ton of iron melted is $23.42 for the cupola and $29.58 for the medium frequency electric furnace.
The commercial sponsors of the clubs with medium frequency had an average of 73 total hours of media exposure with matches broadcasting, being 3 hours on broadcast TV and 70 hours on cable TV.
out of the six affective strategies only item 40 is used highly frequently by the learner wile item 39, 41 and 42 are used with medium frequency and only item 43 has the lowest frequency of use.
The function of matrix [GAMMA] is to reposition the shrunk low and medium frequency DCT coefficients and transform DCT coefficients into pixel domain.
Among these forms of medium frequency electrical stimulation, interferential current (IFC) is a device frequently used clinically, with a higher tissue penetration and less discomfort when compared to low-frequency current.
Making electromagnetic shielding promoted by the authors is based on electromagnetic radiation consumption at low and medium frequency, through a large number of copper turns cages placed in various construction materials, Figure 1, and at the high frequency oscillating circuits placed passive, figure 4, between environment and living space, using for this purpose LC oscillators with resonance frequencies given by different specific frequencies (telephone, radio, radar, etc.) existing in the environment to calculate the resonant frequency [f.sub.0] or circular frequency (angular velocity) [[omega].sub.0] of LC oscillator circuit is used Thomson's relationship
Eoe1/4EoThere is another project to expand the Public Programme through medium frequency. Four stations in Al Buraimi Governorate, the Al Dakhiliyah, the Al Batinah and the Al Sharqiyah regions are currently under study and will be offered for tendering soon, besides the existing stations in Muscat, Al Wusta and Dhofar Governorate,Eoe1/4A[yen] he added.
AaAaAa 'There is another project to expand the Public Programme through medium frequency.Aa There are four stations at the Al-Buraimi Governorate , the Al Dakhiliyah, the Al Batina and the Al Sharqiyah regions currently under study and will be offered for tendering soon; besides the existing stations in Muscat, Al-Wusta and Dhfoar Governorate.
Not to be picky, but I wish to point out that the antenna on the corvette HMCS Shawinigan (misidentified in the photo caption on page 46) was for Medium Frequency Direction Finding (MF/DF) by using, in particular, the Marconi MDF5 receiver which had a frequency range of 265 to 670 kilocycles.
Thirty-two per cent of adults are low frequency, he says, 44%t medium frequency (between once a month and twice weekly) and 19% high frequency.
Two types each of low--and high-frequency data (with or without *) and medium frequency data are shown.

Full browser ?