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Light Notes

Light Notes. Learning Targets: I can…. Compare and contrast light and sound Identify the primary and secondary colors of light and match complementary colors. Light Wave Communication Systems. Can you HEAR light?. Electromagnetic Waves. Light is part of the electromagnetic (EM) spectrum

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Light Notes

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  1. Light Notes

  2. Learning Targets: I can… • Compare and contrast light and sound • Identify the primary and secondary colors of light and match complementary colors.

  3. Light Wave Communication Systems • Can you HEAR light?

  4. Electromagnetic Waves • Light is part of the electromagnetic (EM) spectrum • EM waves… • Created by vibrating electrons • Unique transverse wave • Electric and a magnetic parts • Do not need a medium • Behaviors similar to sound refraction Interference & reflection

  5. The Electromagnetic Spectrum refraction ROYGBIV

  6. A Very Brief History of Light (Ancient Greeks) • Believed that light traveled from our eyes to the objects we look at, rather than from the object to our eyes

  7. A Very Brief History of Light (Galileo) • Used a lantern to try and measure how long it took light to travel from one mountaintop to another

  8. A Very Brief History of Light (Roemer) • Observed how long it took light to be reflected off one of Jupiter’s moon at different times of the year

  9. A Very Brief History of Light (Michelson) • Conducted laboratory experiments with mirrors and reflection to determine the speed of light

  10. A Very Brief History of Light (Morris) • Used a microwave and “thinking putty” to enLIGHTen her AP Physics students

  11. What does did they all discover?!? Light travels really fast… v = 3 x 108 m/s = c In fact, all EM waves travel at this same speed!

  12. The Visible (Light) Spectrum • Wavelengths between 700 (red) and 400 (violet)nanometers • 1 nm = 1 x 10-9 m • Dual nature • Behaves like both a wave and a particle

  13. Colors of Visible Light (ROYGBIV) • Where’s white?! • What about black? • Primary Colors: • Red, Blue, Green • Secondary Colors • R+B = Magenta • R+G = Yellow • B+G = Cyan • Complementary Colors: • R+C = W • B+Y = W • G+M = W

  14. The Human Eye • Retina lined with rods and cones • Cones – color sensing (RGB) • Rods – light intensity sensing • When seeing white, all three cones activated • When seeing black, no light to activate cones

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