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LIGHT (Ch. 16)

“Many hands make light work”. LIGHT (Ch. 16). What makes light work?. Maxwell's Equations J.C. Maxwell 4 Equations Explain all of E-Mag Survived since before Einstein. What is light?. Light is... … electromagnetic waves Diffraction Interference Double-Slit Experiment

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LIGHT (Ch. 16)

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  1. “Many hands make light work” LIGHT (Ch. 16)

  2. What makes light work? • Maxwell's Equations • J.C. Maxwell • 4 Equations • Explain all of E-Mag • Survived since before Einstein

  3. What is light? • Light is... • … electromagnetic waves • Diffraction • Interference • Double-Slit Experiment • Single-Slit Experiment • … particles • Isaac Newton called them “corpuscles” • Photoelectric Effect

  4. What is light? • Light is... • … Umm … It cannot be both... Can it? • Particles do not diffract or interfere • Waves cannot cause the photoelectric effect • Whichever it is, we can use rays to describe it.

  5. That is fast!! • The speed of light • Thought to be infinite • Galileo did not agree • He tried to measure the speed but was unable • 17th century Dutch astronomer Ole Roemer • Calculated it to be 2.2×108 m/s • Albert Michelson • Measured speed of light to be 3×108 m/s • This is a constant: c = 3×108 m/s

  6. Roy G. Biv • Light can be separated into different types depending on (depending how you look at it) wavelength, frequency, or energy • Radio • Microwave • Infrared • Visible • Ultraviolet • X-Ray • Gamma Ray

  7. Roy G. Biv • All we can see is called visible light, and it is a tiny portion of all light. It is further separated into colors, the colors of the rainbow • Red • Orange • Yellow • Green • Blue • Indigo • Violet

  8. Roy G. Biv • Primary Colors of Light • Red • Green • Blue • Secondary Colors • Cyan • Magenta • Yellow • All colors together • White

  9. Polar Bears • Each light wave is only oriented a certain way. • Some materials block light that is not oriented a certain way. • These are called polarizers. • Polarizers can be quite useful, and interesting and fun! • Polarized Sunglasses • Newer 3-D glasses

  10. Doppler Effect • Just like sound waves, light waves can also be shifted in frequency/wavelength by the Doppler Effect. • The equation is a little bit different, although similar

  11. Equations

  12. Assignment • Chapter 16 • 14-17 (page 447) • 52, 60, 63 (pp. 453-454)

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