light waves carry energy from one place to another © 2000 microsoft clip gallery
TRANSCRIPT
LIGHT
Waves carry energy from one place to another
© 2000 Microsoft Clip Gallery
LIGHT: What Is It?
Light Energy Atoms
As atoms absorb energy, electrons jump out to a higher energy level.
Electrons release light when falling down to the lower energy level.
Photons - bundles/packets of energy released when the electrons fall.
Light: Stream of Photons
© 2000 Microsoft Clip Gallery
© 2000 Microsoft Clip Gallery
Electromagnetic Waves
Speed in Vacuum300,000 km/sec186,000 mi/sec
Speed in Other MaterialsSlower in Air, Water, Glass
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Electromagnetic Spectrum
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Electromagnetic Spectrum
Visible Spectrum – Light we can seeRoy G. Biv – Acronym for Red,
Orange, Yellow, Green, Blue, Indigo, & Violet.
Largest to Smallest Wavelength.
Color of Light Transparent Objects:
Light transmitted because of no scattering Color transmitted is color you see. All
other colors are absorbed. Translucent:
Light is scattered and transmitted some. Opaque:
Light is either reflected or absorbed. Color of opaque objects is color it reflects.
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Color of Light (Cont.)
Color of Objects White light is the presence of ALL
the colors of the visible spectrum. Black objects absorb ALL the colors
and no light is reflected back.
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Color of Light (Cont.)
Primary Colors of Light Three colors that can be mixed to produce any other colored light Red + blue + green = white light
Complimentary Colors of Light Two complimentary colors combine to make white light-Magenta,Cyan,Yellow
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Paint Pigments
Pigments absorb the frequency of light that you don’t see and reflects the color that you do see.
Primary pigmentsYellow + cyan + magenta = blackPrimary pigments are compliments of the primary colors of light.
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Complementary Pigments
Green, blue, red Complimentary
pigments are primary colors for light!
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© 2000 Microsoft Clip Gallery
LIGHT & ITS USES
Sources of LightIncandescent light
– light produced by heating an object until it glows.
© 2000 Microsoft Clip Gallery
© 2000 Microsoft Clip Gallery
LIGHT & ITS USES
Fluorescent Light – Light produced by electron
bombardment of gas molecules Phosphors absorb photons that are
created when mercury gas gets zapped with electrons. The phosphors glow & produce light.
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LIGHT & ITS USES - Neon
Neon light – neon inside glass tubes makes red light. Other gases make other colors.
© 2000 Microsoft Clip Gallery
LIGHT & USES: Optical Instruments
LASERSAcronym: Light Amplification by
Stimulated Emission of RadiationCoherent Light – Waves are in
phase so it is VERY powerful & VERY intense.
LIGHT & USES: Optical Instruments
LASERS Holography – Use of Lasers to create
3-D images Fiber Optics – Light energy
transferred through long, flexible fibers of glass/plastic
Uses – Communications, medicine, t.v. transmission, data processing.