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Topic: Visible region

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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.
		The wavelengths of visible light are smaller than common objects such as the thickness of a sheet of paper or the diameter of a human hair.
		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)

	Visible transmitting and infrared reflecting filter - Patent 4229066
		Visible transmitting and infrared reflecting filter having a substrate formed of a material capable of transmitting visible light or absorbing visible light and having a surface and a coating carried by the surface of the substrate.
		The visible transmitting infrared reflecting filter is comprised of a substrate formed of a material which is capable of transmitting or absorbing light at shorter wavelengths i.e.
		When the filter is to be used as a visible transmitting filter, the substrate must necessarily be formed of a material such as fused silica, sapphire and zinc sulphide and any other material capable of transmitting a wide band shorter wavelength region such as the visible region.
	www.freepatentsonline.com /4229066.html (3573 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)

	Light - Visible light
		The visible region, despite being the most familiar to all humans (as it is the only region that the human eyes can see), occupies a very small region of the electromagnetic spectrum, with wavelengths between 7x10
		A common acronym used for the increasing wavelengths in the visible region is VIBGYOR.
		Visible light is also made use in many other machines today such as photoelectric copying machines, laser printers, CD players, FAX machines, optical recording media, and optical disc mass-storage systems of exceedingly high bit density.
	library.thinkquest.org /C006027/html-ver/es-visible.html (324 words)

	The Physics Classroom
		The longer wavelength, lower frequency regions are located on the far left of the spectrum and the shorter wavelength, higher frequency regions are on the far right.
		The focus of Lesson 2 will be upon the visible light region - the very narrow band of wavelengths located to the right of the infrared region and to the left of the ultraviolet region.
		It is because of this that visible light is sometimes referred to as ROY G. The red wavelengths of light are the longer wavelengths and the violet wavelengths of light are the shorter wavelengths.
	www.physicsclassroom.com /Class/light/U12L2a.html (692 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 (can be detected by) 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/Visible_region (922 words)

	Olympus Microscopy Resource Center: Light and Color - Electromagnetic Radiation
		Visible light is a complex phenomenon that is classically explained with a simple model based on propagating rays and wavefronts, a concept first proposed in the late 1600s by Dutch physicist Christiaan Huygens.
		Although the low-energy end of this spectral region is adjacent to visible light, ultraviolet rays at the upper end of their frequency range have enough energy to kill living cells and produce significant tissue damage.
		The visible region of the electromagnetic spectrum lies within a narrow frequency band, from approximately 384 to 769 terahertz (THz) and is perceived as colors ranging from deep red (wavelength of 780 nanometers) to deep violet (400 nanometers).
	www.olympusmicro.com /primer/lightandcolor/electromagintro.html (4927 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 - All FAQs for Light
		Visible light is a narrow range of wavelengths of the electromagnetic spectrum.
		We name regions of the spectrum rather arbitrarily, but the names give us a general sense of the energy of the radiation; for example, ultraviolet light has shorter wavelengths than radio light.
		Visible light covers the range of wavelengths from 400 – 700 nm (from the size of a molecule to a protozoan).
	hubblesite.org /reference_desk/faq/all.php.cat=light (1001 words)

	Topic 2
		The vacuum-UV region is a sub-region that is absorbed strongly by the air.
		region is that portion of the electromagnetic spectrum we perceive as light.
		It is a very small region of the total spectrum ranging from around 400 (violet end of visible spectrum) to 700 nanometers (red end of visible spectrum).
	chemgeo.colstate.edu /pcs/topic52.htm (1013 words)

	Enlightened - Visible
		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.
	library.thinkquest.org /C002213/en/sp-visible.shtml (317 words)

	Remote Sensing @ CES
		A narrow range of EMR extending from 0.4 to 0.7 µm, the interval detected by the human eye, is known as the visible region (also referred to as light but physicists often use that term to include radiation beyond the visible).
		The lowest frequency-longest wavelength region beyond 100 cm is the radio bands, from VHF (very high frequency) to ELF (extremely low frequency); units applied to this region is often stated as frequencies in units of Hertz (1 Hz = 1 cycle per second; KHz, MHz and GHz are kilo-, mega-, and giga- Hertz respectively).
		In the microwave region, by contrast, most of this radiation moves through unimpeded, so radar waves reach the surface (although raindrops cause backscattering that allows it to be detected).
	ces.iisc.ernet.in /hpg/envis/Remote/introfile6.htm (1386 words)

	Galactic Dynamics
		Neutral hydrogen observations outside the visible region of a galaxy indicate the existence of a fourth, non-luminous component - the dark matter halo.
		For regions external to the bulge, the rotation velocity of the material can be measured as a function of radius (on average, orbits are circular) and the enclosed mass calculated using Birkhoff's theorem.
		This region typically extends to 10-25 kpc from the galactic centre and is assumed circular in calculations of inclination and rotation curves.
	astro.ph.unimelb.edu.au /~ctrott/thesis/node5.html (795 words)

	[No title]
		Three TM bands are in the visible region (bands 1,2 and 3), one in the near-visible infrared region (band 4), two in the mid infrared region (bands 5 and 7), and one in the thermal region (band 6).
		The scene is one taken in the region of a tributary of the Yangtze River, Hunan, China.
		SWIR color image is formed by use of a mid infrared region measurement, along with near-visible infrared, and a visible region measurement.
	sedac.ciesin.org /entri-old/rsimages/imagecolorprimer.html (869 words)

	Drawing - Visible Area (Site not responding. Last check: 2007-10-15)
		Although it is a smaller area than is visible from all five towers, nonetheless it covers a large part of the surface because the two selected towers are tall towers that are located on high ridges.
		The result is a new area that shows all parts of the surface visible to both of the two selected towers at the same time.
		Computing visible areas can be a highly computationally intensive task that can take a long time to accomplish with large surfaces or with many viewing points.
	www.manifold.net /doc/700/drawing_visible_area.htm (1313 words)

	Domestic Violence Photography
		Visible light, or white light, is a combination of all the visible colors.
		The visible region of the light spectrum ranges form 400 to 700 nanometers (nm) in wavelength.
		Visible light penetrates deeper into the skin than UV light and is sufficient to document most bruises.
	www.crime-scene-investigator.net /dv-photo.html (2822 words)

	Radio Astronomy
		This area of the electromagnetic (em) spectrum, known as the visible or optical region, is a very tiny part of the entire spectrum that also includes the radio, x-ray, and microwave regions.
		Unlike energy waves in the infrared and ultraviolet regions, radio waves pass through a radio window in the atmosphere and are easily detectable on the Earth's surface.
		The focus is on becoming aware of the features that we see in the optical region versus the radio region, and on recognizing specific galaxies and nebulae in both spectral regions.
	www.scienceteacherprogram.org /astronomy/rachel.html (1214 words)

	Solar transition region - Wikipedia, the free encyclopedia
		The transition region is visible as a low, bright fog over the surface of the Sun and as a thin bright nimbus around the prominence itself.
		The solar transition region is a region of the Sun's atmosphere, between the chromosphere and corona.
		The transition region is visible in FUV images from the TRACE spacecraft, as a faint nimbus above the dark (in FUV) surface of the Sun and the corona.
	en.wikipedia.org /wiki/Solar_transition_region (626 words)

	Glass article having a solar control coating - Patent 5780149
		The selectivity, or the transmittance of visible light and the attenuation of near infrared energy, is accomplished through the utilization of at least first and second transparent coatings having similar refractive indices in the visible region while possessing different refractive indices in the near infrared region.
		The doped oxides have a very low refractive index in the near infrared region due to the free electrons in the material and therefore permit the selection of a second transparent coating with a high refractive index to build a near infrared reflecting area at the interface between the first and second transparent coatings.
		The layers all have similar refractive indices in the visible region to permit the transmittance of a high degree of visible light.
	www.freepatentsonline.com /5780149.html (6225 words)

	Atomic Emission Spectroscopy (Site not responding. Last check: 2007-10-15)
		It is possible to induce hydrogen atoms to emit visible light by exciting them, as by applying a high electrical potential.
		Using an optic arrangement called a spectroscope, it is possible to resolve the visible light emitted into its component colors and to determine their wavelengths.
		All the transitions in the visible spectrum of hydrogen terminate on the n = 2 level.
	www.nv.cc.va.us /alexandria/science/AtomicEmission00.htm (353 words)

	Solar Energy Technologies Program: Light and the PV Cell
		Red light is at the low-energy end of the visible spectrum and violet light is at the high-energy end, where it has half again as much energy as red light.
		In the invisible portions of the spectrum, radiation in the ultraviolet region, which causes the skin to tan, has more energy than that in the visible region.
		The quantity of sunlight reaching any region is also affected by the time of day, the climate (especially the cloud cover, which scatters the sun's rays), and the air pollution in that region.
	www.eere.energy.gov /solar/pv_cell_light.html (1312 words)

	Creating a Scrollable Region (Site not responding. Last check: 2007-10-15)
		To create a scrollable region for a data form, you first define the region and then the fields that will appear in the scrollable region.
		Code: To define the scrollable region, you call a function and pass the area of the form the region will cover, the type of border to put around the region, the number of underlying data rows, and a pointer to a data structure to store the data for the scrollable region.
		While a data field outside of a scrollable region is most commonly associated with a single underlying data variable throughout form processing, a data field in a scrollable region is associated with whatever underlying data variable the user has just scrolled into it.
	www.vtsoft.com /VVHTMLHelp/VVUsersGd/htm/creatingascrollableregion.htm (373 words)

	UV/Visible Spectrophotometry
		The Ultra-Violet(UV) and Visible regions of the electromagnetic spectrum are associated with a large enough Kinetic Energy that the energy that is absorbed will affect the energy states of electrons occupying the molecular orbitals within the molecule.
		For the Visble Region the radiation source must be changed to a tungsten filament similar to the ones found in a common incandescent light bulb.
		For the visble region, compartments composed of simple pyrex glass is sufficient since pyrex will absorb in the UV but will not absorb in the visible region.
	members.aol.com /logan20/uv.html (1829 words)

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