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Topic: Electromagnetic spectrum

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In the News (Wed 17 Apr 19)

  Electromagnetic spectrum - Wikipedia, the free encyclopedia
The electromagnetic spectrum is the range of all possible electromagnetic radiation.
The electromagnetic spectrum, shown in the table, extends from frequencies used in the electric power grid (at the long-wavelength end) to gamma radiation (at the short-wavelength end), covering wavelengths from thousands of kilometres down to fractions of the size of an atom.
Electromagnetic spectroscopy is the branch of physics that deals with the characterization of matter by its spectra.
en.wikipedia.org /wiki/Electromagnetic_spectrum   (1438 words)

 Defense Issues: Volume 11, Number 83-- Electromagnetic Spectrum: Key to Success in Future Conflicts   (Site not responding. Last check: 2007-09-20)
The reallocation of government spectrum executed over the past decade and the upcoming reallocation of spectrum associated with Title IV of the Omnibus Budget Reconciliation Act of 1993 are already forcing DoD to re-engineer or replace equipment that is still effective and long before the end of its planned life cycle.
The department fears the spectrum upon which our ability to execute national security missions depends will be reduced to the vanishing point; reduced to the point that we cross the threshold being unable to provide adequate support to our young men and women in the field and the units to which they are assigned.
Lastly, the spectrum we move to often is less optimal for the functions concerned that the spectrum we leave.
www.defenselink.mil /speeches/1996/s19960710-paige.html   (2706 words)

 The Physics Classroom
Electromagnetic waves are produced by a vibrating electric charge and as such, they consist of both an electric and a magnetic component.
In this sense, we are referring to visible light, a small spectrum of the range of frequencies of electromagnetic radiation.
When all the wavelengths of the visible light spectrum strike your eye at the same time, white is perceived.
www.physicsclassroom.com /Class/light/U12L2a.html   (692 words)

 Electromagnetic Spectrum   (Site not responding. Last check: 2007-09-20)
The electromagnetic spectrum is a continuum of all electromagnetic waves arranged according to frequency and wavelength.
Electromagnetic energy passes through space at the speed of light in the form of sinusoidal waves.
The range of visible consists of the narrow portion of the spectrum, from 0.4 microns (blue) to 0.7 microns (red).
www.geo.mtu.edu /rs/back/spectrum   (154 words)

 Electromagnetic Spectrum - Introduction
The electromagnetic (EM) spectrum is just a name that scientists give a bunch of types of radiation when they want to talk about them as a group.
Electromagnetic radiation can be described in terms of a stream of photons, which are massless particles each traveling in a wave-like pattern and moving at the speed of light.
Electromagnetic radiation from space is unable to reach the surface of the Earth except at a very few wavelengths, such as the visible spectrum, radio frequencies, and some ultraviolet wavelengths.
imagine.gsfc.nasa.gov /docs/science/know_l1/emspectrum.html   (1292 words)

 The Electromagnetic Spectrum   (Site not responding. Last check: 2007-09-20)
The electromagnetic spectrum is the distribution of electromagnetic radiation according to energy (or equivalently, by virtue of the relations in the previous section, according to frequency or wavelength).
A graphical representation of the electromagnetic spectrum is shown in the figure below.
The visible part of the spectrum may be further subdivided according to color, with red at the long wavelength end and violet at the short wavelength end, as illustrated (schematically) in the following figure.
csep10.phys.utk.edu /astr162/lect/light/spectrum.html   (205 words)

 Lesson Plans -- The Electromagnetic Spectrum: Waves of Energy -- (6-8, Physical Science)   (Site not responding. Last check: 2007-09-20)
The terms “electromagnetic waves” and “electromagnetic radiation” are used interchangeably because the waves carry the sun’s radiation, which is composed of electrically charged particles.
Explain that electromagnetic radiation is arranged in the spectrum from the longest wavelength to the shortest.
Knows the range of the electromagnetic spectrum (e.g., radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, x-rays, gamma rays); electromagnetic waves result when a charged object is accelerated or decelerated, and the energy of the electromagnetic waves is carried in packets whose magnitude is inversely proportional to the wavelength
school.discovery.com /lessonplans/activities/electromagneticspectrum   (1993 words)

 CHP - Electromagnetic Spectrum   (Site not responding. Last check: 2007-09-20)
A 350-nm photon is in the ultraviolet portion of the electromagnetic spectrum.
The visible region of the electromagnetic spectrum consists of photons with wavelengths from approximately 400 to 700 nm.
The short wavelength cutoff is due to absorption by the lens of the eye and the long wavelength cutoff is due to the decrease in sensitivity of the photoreceptors in the retina for longer wavelengths.
www.chem.vt.edu /chem-ed/light/em-spec.html   (262 words)

 EM Spectrum
Infrared is the region of the electromagnetic spectrum that extends from the visible region to about one millimeter (in wavelength).
The rainbow of colors we know as visible light is the portion of the electromagnetic spectrum with wavelengths between 400 and 700 billionths of a meter (400 to 700 nanometers).
It is the part of the electromagnetic spectrum that we see, and coincides with the wavelength of greatest intensity of sunlight.
www.electro-optical.com /bb_rad/emspect.htm   (850 words)

 Reading on Color & Light, Part I
The electromagnetic spectrum, which encompasses the visible region of light, extends from gamma rays with wave lengths of one hundredth of a nanometer to radio waves with wave lengths of one meter or greater.
Figure 1 shows electromagnetic radiation as a spectrum of radiation extending beyond the visible radiation to include at one end radio waves and at the other end gamma rays.
Visible light is the range of wavelengths within the electromagnetic spectrum that the eye responds to.
acept.la.asu.edu /PiN/rdg/color/color.shtml   (1624 words)

 Chemical Sciences: The Electromagnetic Spectrum
The visible region, which is the region of the electromagnetic spectrum visible to the average human eye, extends from about 200 nm to 900 nm.
The region of the electromagnetic spectrum between 1 nm and 400 nm, adjacent to the visible region, is called the ultraviolet region because it is just beyond violet, the color at the high-energy, short-wavelength, and high-frequency end of the visible region.
The region of the electromagnetic spectrum with wavelengths greater than 900 nm adjacent to the visible region is called the infrared region because it lies just beyond red, the color at the low-energy, long-wavelength, and low-frequency end of the visible region.
www.psigate.ac.uk /newsite/reference/plambeck/chem1/p01211.htm   (574 words)

It is up to you and your employees to determine what is fact and what is fiction concerning electromagnetic radiation, and to present this information to the public.
One member may write an article on properties of the type of electromagnetic radiation your group is researching, another on health issues relating to that type of radiation, yet another may be responsible for advertisements.
Upon completion, each of the separate newsletters will be combined into a class document referencing the different types of electromagnetic radiation, the properties of each of these types of radiation, as well as health and safety issues regarding each.
www.geocities.com /kbachhuber2000/ems.html   (547 words)

The evolution of UV dominant optical spectrum is from Core - and valence excited atoms, isolated from the rest of the unexcited atoms in metals.
Electromagnetic spectrum usually depicted by various authors is normally intended to show energy distribution.
The above spectrum is an artistic view of Rb X-rays, wavelength gap that accomadates Bharat radiation, and atomic spectrum from a single Rb XRF source.
www.geocities.com /raomap/discovery5.html   (2672 words)

 The Electromagnetic and Visible Spectra
Two very narrow regions within the spectrum are the visible light region and the X-ray region.
You are undoubtedly familiar with some of the other regions of the electromagnetic spectrum.
In this sense, we are referring to visible light, a small spectrum of the enormous range of frequencies of electromagnetic radiation.
www.glenbrook.k12.il.us /gbssci/phys/Class/light/u12l2a.html   (670 words)

 HubbleSite - Spectrum 101
Visible light is a form of electromagnetic radiation — along with radio waves, microwaves, infrared radiation, ultraviolet rays, X-rays, and gamma rays.
On one end of the spectrum are radio waves having wavelengths billions of times longer than those of visible light.
On the other end of the spectrum are gamma rays, with wavelengths millions of times smaller than those of visible light.
hubblesite.org /sci.d.tech/nuts_.and._bolts/spec101.shtml   (333 words)

 Electromagnetic Radiation Spectrum (Definitrions, Sources, Symptoms, Testing Equipment & Procedures, Exposure ...
Electromagnetic Radiation Spectrum (0Hz to 10^27 Hz) (Definitions, Physics, and Properties, Sources of Radiation, Overexposure Symptoms, Testing Equipment and Procedures, Exposure Limits, Standards and Laws, Shielding and Jamming, Medical and Technical Protection, EMF Agencies, Organizations To Contact For Help, Reference Materials) * 2.
Infrared Radiation Spectrum (10^11 Hz to 10^15 Hz) 12.
Electromagnetic brain waves (0.1 to 30hz) occur at frequencies paralleling those of terrestrial sferics and the Schuman resonance.
www.rhfweb.com /hweb/shared2/Newrad.html   (4270 words)

 Electromagnetic Spectrum   (Site not responding. Last check: 2007-09-20)
All electromagnetic waves are classified according to their characteristic frequencies, into what is known as...
Most of the electromagnetic spectrum is invisible, and exhibits frequencies that traverse its entire breadth.
The electromagnetic spectrum represents a continuum of frequencies.
archive.ncsa.uiuc.edu /Cyberia/Bima/spectrum.html   (410 words)

 Howstuffworks "How Light Works"
The size of a wave is measured as its wavelength, which is the distance between any two corresponding points on successive waves, usually peak-to-peak or trough-to-trough (Figure 1).
But the full range of wavelengths included in the definition of electromagnetic radiation extends from one billionth of a meter, as in gamma rays, to centimeters and meters, as in radio waves.
Light is one small part of the spectrum.
science.howstuffworks.com /light2.htm   (372 words)

 KryssTal : The Electromagnetic Spectrum
There are many chemical reactions that are instigated by this radiation: the chemical retinal in animal eyes, chlorophyll in plants, silver chloride in photography, the chemical melanin in human skin, silicon converts light to electricity.
Light is the most familiar electromagnetic radiation because the Earth's atmosphere is transparent to it.
Visible Light is simply the part of the electromagnetic spectrum that reacts with the chemicals in our eyes.
www.krysstal.com /spectrum.html   (1870 words)

 Trial.html   (Site not responding. Last check: 2007-09-20)
The judge, the prosecutor, the counselor for the defense, the defendant (electromagnetic spectrum), and the jury are selected from among the students of a class.
The real "biography" of the accused spectrum can be made into the public appearance of the "defendant", and the jury should ask questions to specify the details and to try to make the whole process of the trial more effective and animated.
When the electromagnetic spectrum is considered from the legal point of view, it becomes obvious that the phenomenon has more merits then shortcomings.
cse.ssl.berkeley.edu /lessons/indiv/nellie/new_nelli_trial.html   (2855 words)

Use the Electromagnetic Wave simulation and determine the how many times greater the average radio wave wavelength is to the average gamma ray wavelength.
Click and drag the white vertical position marker across the Electromagnetic spectrum simulation and determine where the large frequency waves are located.
Click and drag the white vertical position line across the electromagnetic spectrum simulation and determine where the most energetic waves are to be found.
www.hazelwood.k12.mo.us /~grichert/sciweb/emwave.htm   (681 words)

The rainbow is a natural spectrum caused by the refraction and reflection of sunlight through raindrops, and shows that sunlight consists of a continuous run - - a continuum -- of colors from red to violet.
The visual spectrum of light, however, is but a tiny portion of the whole picture, of a huge spectrum of radiation that extends in both directions from the edges of the rainbow.
They are unified by thinking of them as "electromagnetic waves," waves of alternating strength in electric and magnetic fields that all move through space at the "speed of light" (called "c") of 300,000 kilometers per second (186,000 miles per second), eight times around the Earth in the tick of a clock.
www.astro.uiuc.edu /~kaler/sow/spectra.html   (5857 words)

 Electromagnetic Spectrum
The electromagnetic spectrum is a map of all the types of light that we can identify.
Not all light is in the visible spectrum, which is the light you can see.
Radio waves are found at the longest wavelengths on the electromagnetic spectrum.
cmb.physics.wisc.edu /tutorial/spectrum.html   (435 words)

 The EM Spectrum   (Site not responding. Last check: 2007-09-20)
Optical light is only a small part of the much more expansive electromagnetic spectrum that includes everything from so-called gamma rays at the shortest wavelengths to radio waves at the longest wavelengths.
The violet and red "ends" of the optical spectrum are not really "ends" at all, but rather simply the limits to the portion of the EM spectrum to which our eyes are sensitive.
Likewise, beyond the violet of the optical spectrum lies a broad region known as the ultraviolet, which blends into the X-ray region, followed by the the shortest wavelength radiation known, the gamma rays.
fuse.pha.jhu.edu /~wpb/spectroscopy/em_spec.html   (624 words)

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