Download - Sunlight
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SunlightSunlight
Plasma at extremely high temperatures.
6,000 ºC Outer 1.5x107 ºC Inner
[http://www.astronomy.com/asy/objects/images/sun_full_disk_soho_09_14_1997.jpg]
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Rather uniform spectrum of colors
[http://www.videoessentials.com/images/res_spectral12.gif]
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Incandescent LightIncandescent Light These heat a
piece of metal until it produces light.
The thin piece of metal is called a filament.
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[http://www.videoessentials.com/images/res_spectral12.gif]
Mainly red/orange/yellow in spectrum of incandescent lights
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Incandescent LightIncandescent Light
About 80% of the energy used is converted to heat (infrared).
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Fluorescent LightsFluorescent Lights
A glass tube is covered with phosphors that give off light when UV rays from the gas inside are given off.
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[http://www.videoessentials.com/images/res_spectral12.gif]
Mainly blue/green in spectrum of fluorescent lights
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Fluorescent LightsFluorescent Lights
Uses one-fifth the energy of an incandescent light bulb.
Can contain mercury so must be recycled after use.
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Neon LightsNeon Lights
Electricity is passed through a glass tube filled with gas, and the particles collide and give off light.
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This creates an emission spectrum of “lines” at certain colors
[http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/modpic/neoncomp.jpg]
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LasersLasers
Atoms of a gas are charged with energy and they in turn all give off light with the same wavelength.
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LasersLasers
Used in medicine and in reading optical data (CD’s, DVD’s)
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Tungsten-Halogen LightsTungsten-Halogen Lights
The filament is made of the Tungsten which can create a tremendous amount of heat, and light.
[http://www.daviddarling.info/images/tungsten_halogen_lamp.jpg]
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Has a rather uniform spectrum and is somewhat energy efficient.
[http://www.molecularexpressions.com/primer/lightandcolor/images/lightsourcesfigure3.jpg]
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Sodium-Vapor LampsSodium-Vapor Lamps
Sodium metal becomes very hot and changes to a vapor to produce yellow-orange light.
[http://upload.wikimedia.org/wikipedia/en/6/63/Na-lamp-2.jpg]
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Can be used outdoors to reduce light pollution at night.
[http://www.sao.arizona.edu/FLWO/LIGHT/MontePatria2.jpg]
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Uses of LightUses of Light
Polarizing Filters Only light waves
that are vibrating in one direction pass through.
Used in sunglasses to block “glare”
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Uses of LightUses of Light
Optical Fibers Light waves pass
through a glass tube for communication purposes.
Telephone, TV, Internet
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Total Internal Reflection allows the light waves to “travel” through the tube.
Click here for a demonstration