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Topic: Visible spectrum

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	Optical spectrum
		The optical spectrum (visible spectrum) is the portion of the electromagnetic spectrum that is visible to the human eye (see color for the sequence of colors).
		Wavelengths in the range visible to the eye occupy most of the "optical window", a range of wavelengths that are easily transmitted through the Earth's atmosphere.
		The term "optical spectrum" originally applied only to that region of the electromagnetic spectrum which is visible to the normal human eye, but is now considered to include all wavelengths between the shortest wavelengths of X-rays and the longest of radio.
	www.ebroadcast.com.au /lookup/encyclopedia/vi/Visible.html (250 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.
		Visible light is the range of wavelengths within the electromagnetic spectrum that the eye responds to.
		The region of visible light in wavelengths shown as a linear arrangement (a) and as a circle (b) as conceived by Sir Isaac Newton.
	acept.la.asu.edu /PiN/rdg/color/color.shtml (1624 words)

	Electromagnetic spectrum - Biocrawler (Site not responding. Last check: 2007-10-13)
		The electromagnetic spectrum, shown in the table, extends from electric power 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.
		Visible light (and near-infrared light) is typically absorbed and emitted by electrons in molecules and atoms that move from one energy level to another.
		A rainbow shows the optical (visible) part of the Electromagnetic Spectrum; Infrared (if you could see it) would be located just beyond the red side of the rainbow with Ultraviolet appearing just beyond the violet end.
	www.biocrawler.com /encyclopedia/Electromagnetic_spectrum (1401 words)

	UV-Visible Spectroscopy
		Electromagnetic radiation such as visible light is commonly treated as a wave phenomenon, characterized by a wavelength or frequency.
		The visible region of the spectrum comprises photon energies of 36 to 72 kcal/mole, and the near ultraviolet region, out to 200 nm, extends this energy range to 143 kcal/mole.
		Since isoprene is colorless, it does not absorb in the visible part of the spectrum and this region is not displayed on the graph.
	www.cem.msu.edu /~reusch/VirtualText/Spectrpy/UV-Vis/spectrum.htm (2030 words)

	Visible spectrum - Wikipedia, the free encyclopedia
		The visible spectrum (or sometimes optical spectrum) is the portion of the electromagnetic spectrum that is visible to the human eye.
		There are no exact bounds to the visible spectrum; a typical human eye will respond to wavelengths from 400 to 700 nm, although some people may be able to perceive wavelengths from 380 to 780 nm.
		Wavelengths visible to the eye also pass through the "optical window", the region of the electromagnetic spectrum which passes largely unattenuated through the Earth's atmosphere (although blue light is scattered more than red light, which is the reason the sky is blue).
	en.wikipedia.org /wiki/Optical_spectrum (975 words)

	Electromagnetic Spectrum
		The range adjacent to the visible spectrum is called the "near infrared" and the longer wavelength part is called "far infrared".
		The narrow visible part of the electromagnetic spectrum corresponds to the wavelengths near the maximum of the Sun's radiation curve.
		In interactions with matter, gamma rays are ionizing radiation and produce physiological effects which are not observed with any exposure of non-ionizing radiation, such as the risk of mutations or cancer in tissue.
	hyperphysics.phy-astr.gsu.edu /hbase/ems3.html (537 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 /the_telescope/nuts_.and._bolts/spec101.shtml (333 words)

	Electromagnetic Spectrum \| World of Physics
		The region of the electromagnetic spectrum that contains light at frequencies and wavelengths that stimulate the rod and cones in the human eye is termed the visible region of the electromagnetic spectrum.
		Using this unit, the visible portion of the electromagnetic spectrum is located between 380nm-750nm and the component color regions of the visible spectrum are Red (670-770 nm), Orange (592-620 nm), Yellow (578-592 nm), Green (500-578 nm), Blue (464-500 nm), Indigo (444-464 nm), and Violet (400-446 nm).
		Just above the visible spectrum in terms of higher energy, higher frequency, and shorter wavelengths is the ultraviolet region of the spectrum with light ranging in wavelength from 400 to 10 billionths of a meter.
	www.bookrags.com /research/electromagnetic-spectrum-wop (1012 words)

	Electromagnetic Spectrum (Site not responding. Last check: 2007-10-13)
		Visible light is made up of electromagnetic waves, vibrations of electric and magnetic fields that propagate through space.
		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)

	SLU Physics - The Visible Spectrum of Hydrogen vs. Deuterium
		In this projects, we calculated three of the visible wavelengths in the hydrogen spectrum to be 656.478 nm, 486.542 nm, and 434.415 nm.
		For deuterium we measured the visible wavelengths to be 656.295 nm, 486.315 nm, and 434.115 nm.
		We conclude that the percent error between the differences in wavelengths between the spectrum of hydrogen and the spectrum of deuterium to be 1.65%, 5.3%, and 2.5% for the wavelengths of red, blue, and violet respectively.
	it.stlawu.edu /~physics/stuff/student_projects/2001/fiacco.shtml (260 words)

	NASA's Solar System Exploration: Science & Technology: What is the Electromagnetic Spectrum? What is Infrared? How was ...
		The visible portion is represented by the small rainbow near the center.
		Nearinfrared refers to the part of the infrared spectrum that is closest to visible light and farinfrared refers to the part that is closer to the microwave region.
		During this experiment he measured the temperature of the individual colors of visible radiation to find that the temperature of the colors increased from the violet to the red part of the visible spectrum.
	solarsystem.nasa.gov /scitech/display.cfm?ST_ID=326 (840 words)

	Visible Light Waves
		Visible light waves are the only electromagnetic waves we can see.
		However, since visible light is the part of the electromagnetic spectrum that our eyes can see, our whole world is oriented around it.
		This is a visible light image of Phoenix, Arizona, taken from the GOES satellite.
	imagers.gsfc.nasa.gov /ems/visible.html (691 words)

	The Electromagnetic and Visible Spectra
		In this sense, we are referring to visible light, a small spectrum of the enormous range of frequencies of electromagnetic radiation.
		Each individual wavelength within the spectrum of visible light wavelengths is representative of a particular color.
		When all the wavelengths of the visible light spectrum strike your eye at the same time, white is perceived.
	www.glenbrook.k12.il.us /gbssci/phys/Class/light/u12l2a.html (670 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.
		Visible light is the light that we can see, and thus is the only light detectable by the human eye.
	cmb.physics.wisc.edu /tutorial/spectrum.html (435 words)

	CHP - Electromagnetic Spectrum (Site not responding. Last check: 2007-10-13)
		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)

	The Electromagnetic Spectrum (Site not responding. Last check: 2007-10-13)
		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).
		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.
		In modern usage, indigo is not usually distinguished as a separate color in the visible spectrum; thus Roy no longer has any vowels in his last name.
	csep10.phys.utk.edu /astr162/lect/light/spectrum.html (205 words)

	What Wavelength Goes With a Color?
		The white light is a mixture of the colors of the visible spectrum.
		Because the blue wavelengths are shorter in the visible spectrum, they are scattered more efficiently by the molecules in the atmosphere.
		Grass, for example, appears green because all of the colors in the visible part of the spectrum are absorbed into the leaves of the grass except green.
	eosweb.larc.nasa.gov /EDDOCS/Wavelengths_for_Colors.html (616 words)

	Visible and Infrared Spectrum Chapter 10
		Be acquainted with the visible and infrared portion of the electromagnetic frequency spectrum.
		Roughly speaking, the visible range for a large dark object against the horizon is the distance at which the brightness difference between the object and sky is 2%.
		In the visible spectrum, significant background "noise" is generated by the sun, moon (reflected sunlight), stars, and the wide variety of man made light sources.
	www.fas.org /man/dod-101/navy/docs/fun/part10.htm (10100 words)

	Color (Site not responding. Last check: 2007-10-13)
		In a rainbow or the separation of colors by a prism we see the continuous range of spectral colors (the visible spectrum).
		It is safe enough to say that monochromatic light like the helium-neon laser is red (632 nm) or that the 3-2 transition from the hydrogen spectrum is red (656 nm) because they fall in the appropriate wavelength range.
		The visible spectrum is roughly from 700 nm (red end) to 400 nm (violet end).
	hyperphysics.phy-astr.gsu.edu /hbase/vision/specol.html (361 words)

	E & M Spectrum: Visible (Site not responding. Last check: 2007-10-13)
		Occupying a very small part of the entire electromagnetic spectrum, the visible light region is the only range of energies that human eyes can detect.
		Actually, the maximum sensitivity of our eyes is in the yellow (which is a mixture of green and red energies), probably because we have evolved on a planet which is bathed in yellow sunlight.
		Some people's eyes are sensitive to wavelengths (energies) beyond the normal visible region; they can see a little into the ultraviolet and down into the infrared.
	acept.la.asu.edu /PiN/mod/light/colorspectrum/visible.html (357 words)

	Visible Light Spectrum (Site not responding. Last check: 2007-10-13)
		The picture bottom left is the corresponding spectrum for an energy saving lamp and shows that some colours are clearly 'missing', and that the intensity of violet has been increased.
		Visible light is a miniscule part of a large, continuous spectrum of electromagnetic radiation.
		Beyond the red end of the visible spectrum is infrared radiation (Infra=below) sensed as heat, and radio waves.
	www.kgg.org.uk /spectrumh.html (271 words)

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