electromagnetic spectrum


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electromagnetic spectrum

the range of frequencies and wavelengths associated with radiant energy.

e·lec·tro·mag·net·ic ra·di·a·tion

, electromagnetic spectrum (ĕ-lek'trō-mag-net'ik rā'dē-ā'shŭn, spek'trŭm)
Wavelike energy propagated through matter or space; varies widely in wavelength, frequency, photon energy, and properties; may be natural or artificial and includes radiowaves, microwaves, heat waves, visible light, ultraviolet light, x-rays, gamma rays, and cosmic radiation.

electromagnetic spectrum

The continuum of radiation, varying in frequency, and, correspondingly, wavelength, that includes, in order of decreasing frequency, cosmic ray photons, gamma rays, X rays, ultraviolet radiation, visible light, infrared radiation, microwaves, radio waves and heat.
Electromagnetic spectrumclick for a larger image
Fig. 142 Electromagnetic spectrum . The wavelength ranges of the electromagnetic spectrum.

electromagnetic spectrum

the entire range of wavelengths of electromagnetic radiation, most of which are not detectable by the human eye except in the visible spectrum from about 400–700 nm wavelength. Wavelengths shorter than the visible spectrum contain large quantities of energy which can be harmful to living material. See Fig. 141 . See X-RAY, GAMMA RADIATION, ULTRAVIOLET LIGHT.

electromagnetic spectrum (·lekˈ·trō·mag·neˑ·tik spekˑ·trm),

n the entire range of electromagnetic radiation that extends from the longest (radio waves) to the shortest (gamma radiation) wavelengths.

e·lec·tro·mag·net·ic ra·di·a·tion

, electromagnetic spectrum (ĕ-lek'trō-mag-net'ik rā'dē-ā'shŭn, spek'trŭm)
Wavelike energy propagated through matter or space; varies widely in wavelength, frequency, photon energy, and properties; may be natural or artificial and includes x-rays, gamma rays, and other forms.
References in periodicals archive ?
Policymakers will continue to learn from the lessons of the past and proceed with caution to assure they are safeguarding future public spectrum interests and the electromagnetic spectrum itself.
The AOC is a not-for-profit international Electronic Warfare/Information Operations (EW/IO) association which promotes electromagnetic spectrum operations and related activities across military, civilian and commercial applications.
A wise young naval officer recently commented that warfighters fight in two domains: the one aligned to their service, and the electromagnetic spectrum (EMS).
They can already generate laser-like X-ray beams in the soft X-ray region and believe they have discovered how to extend the process all the way into the hard X-ray region of the electromagnetic spectrum.
In 200 years, they will say that today [was] the golden era of astronomy because the entire electromagnetic spectrum has been opened up," says Dave Finley of the National Radio Astronomy Observatory in Socorro, New Mexico.
We're also pushing to modernize and grow our warfighting capabilities in cyberspace, which we see as an increasingly important warfighting domain, the battlespace and of electronics and the electromagnetic spectrum.
Users can determine with extraordinary precision the frequencies in signals, such as light from a cloud of excited atoms, by comparing the unknown frequencies with the precisely known positions of comb frequencies along the electromagnetic spectrum.
At present, most Nato countries use a Nato green colour, which delivers a specific infrared reflectance value across a wide swath of the electromagnetic spectrum, yet are not identical for all specifications.
Besides carbon taxes, other global tax proposals include taxes on e-commerce and even international e-mails, taxes on aviation fuel, taxes on the use of ocean shipping lanes, taxes on the use of the electromagnetic spectrum, fees to "rent" outer space for orbiting satellites, and taxes on envisioned future mining of the deep seabed.
SURF uses a relativistic electron beam, confined by a magnetic field to a circular orbit of 84 cm radius, that emits a broad continuum of radiation that spans the electromagnetic spectrum from the FM radio region to the soft x-ray domain.
Telescopes invented by Leighton, called Leighton dishes, straddle the line between light and radio telescopes, allowing astronomers to analyze a relatively unexplored area of the electromagnetic spectrum.
Virtually every region of the electromagnetic spectrum has been adapted to chemical instrumentation.

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