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 ?
VIDEO EXTRA: Watch a video about the electromagnetic spectrum at: http://missionscience.
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.
Brig Gen Edward Sauley, USAF, Deputy Director of Operations for Joint Electromagnetic Spectrum Operations, USSTRATCOM will describe the efforts for attaining and maintaining electromagnetic spectrum superiority through EMS control.
This past winter, the recommended SAR&DP investment portfolio was endorsed by the DoD Electromagnetic Spectrum Capabilities Assessment Group and the Spectrum Command, Control, Communications, Computers, and Cyber Leadership Board.
DARPA Challenges have traditionally rewarded teams that dominate their competitors, but when it comes to making the most of the electromagnetic spectrum, the team that shares most intelligently is going to win, said SC2 program manager Paul Tilghman of DARPAs Microsystems Technology Office (MTO).
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.
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.
The US Air Force's B-2 Spirit bomber is about to receive a new active electronically scanned array (AESA) to replace its current radar, which operates in a portion of the electromagnetic spectrum in which the Department of Defense (DoD) are considered secondary users.
The TravelIR uses mid-infrared spectroscopy to cover the "fingerprint" region of the electromagnetic spectrum, Rein explained.
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.

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