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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
Electromagnetic Waves Speed in Vacuum 300,000 km/sec 186,000 mi/sec Speed in Other Materials Slower in Air, Water, Glass © 2000 Microsoft Clip Gallery
Electromagnetic Spectrum © 2000 Microsoft Clip Gallery
Electromagnetic Spectrum Visible Spectrum – Light we can see Roy 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. © 2000 Microsoft Clip Gallery
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. © 2000 Microsoft Clip Gallery
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 © 2000 Microsoft Clip Gallery
Paint Pigments Pigments absorb the frequency of light that you don’t see and reflects the color that you do see. Primary pigments Yellow + cyan + magenta = black Primary pigments are compliments of the primary colors of light. © 2000 Microsoft Clip Gallery
Complementary Pigments Green, blue, red Complimentary pigments are primary colors for light! © 2000 Microsoft Clip Gallery
LIGHT & ITS USES Sources of Light Incandescent light – light produced by heating an object until it glows. © 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. © 2000 Microsoft Clip Gallery
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 LASERS Acronym: Light Amplification by Stimulated Emission of Radiation Coherent 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.
LIGHT and COLOR © 2000 Microsoft Clip Gallery. Albert Einstein.
Waves carry energy from one place to another
Electromagnetic Waves and Light
MAP TAP The Electromagnetic Spectrum1 Light and the Electromagnetic Spectrum Chapters 22 & 23.
Light and Color. Light interacting with matter When light hits matter, at least one of three things can happen: – Reflection When light bounces off an.
Chapter 18: The Electromagnetic Spectrum and Light
Light Chapter 13.
CP Physics Mr. Miller. General Information Sir Isaac Newton – first to realize white light composed of different colors Prisms – separate white light.
Vocabulary Mini-Review EM Spectrum & Light. What part of the EM spectrum is used for communication? Radio Waves.
WAVES: LIGHT Waves carry energy from one place to another © 2000 Microsoft Clip Gallery.
E-M Spectrum and Waves Prentice Hall Chapter 18.
Light and Color.
And Elvis said ……… ……Let there be Light The Visible Spectrum.
The electrons within atoms are the sources of all light.
Introduction to Optics. 1. The Great Debate 2. What is light? 3. Properties of light 4. The wave-like model 5. Theories of colour.
1. The blind spot of the human eye results from a) rods attached to the retina. b) cones attached to the fovea. c) a detached retina. d) the optic nerve.
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