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Light and Color

Light and Color. Electromagnetic Spectrum. Tour the electromagnetic spectrum. http://www.pbs.org/wgbh/nova/physics/electromagnetic-spectrum.html http://missionscience.nasa.gov/ems/01_intro.html. What is the speed of an electromagnetic wave?. All waves travel at the speed of light

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Light and Color

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  1. Light and Color

  2. Electromagnetic Spectrum

  3. Tour the electromagnetic spectrum http://www.pbs.org/wgbh/nova/physics/electromagnetic-spectrum.html http://missionscience.nasa.gov/ems/01_intro.html

  4. What is the speed of an electromagnetic wave? All waves travel at the speed of light 3 x 108 m/s

  5. How does this compare to sound Light travels faster than sound For example fireworks and lightning

  6. Does anything affect the speed? Traveling though different mediums affect speed. In what medium below does speed go the fastest and slowest? • Air • Vacuum • Water

  7. Speed of light through mediums Through a vacuum like space?

  8. Speed of light through medium Through air?

  9. Speed of light through medium Through water?

  10. Why does this happen?

  11. Visible light

  12. How do we remember colors? RoyGBiv video: http://vimeo.com/5377784

  13. Why is the sky blue? Higher frequency light is scattered more easily. The purple end of the visible light reflects off particles in the atmosphere and appear to our eyes.

  14. Speed C = λf where c = 3 x 108 m/s

  15. C is the same for all EM waves Because c is the same, the relationship of λ and f are inversely proportional. As λ goes up f goes down and vice versa

  16. What type of wave is a light wave? Light is an electromagnetic wave and transverse. It is a combination of electric and magnetic fields.

  17. Polarized Light Why do you wear polarized sun glasses?

  18. Polarized lens Demo of lenses

  19. Light transmission through lens Only some light is transmitted through a polarized lens. Transmission-light passing through a medium

  20. When light shines on surfaces • Transmission-passing through of light • Reflection-light bouncing off • Absorption-light not reflecting or transmitting

  21. Light on surfaces

  22. Why do we see color? Color or visible light is the light that is reflected. The color you see is the reflected light, all other colors are absorbed.

  23. Which surface is cooler on a sunny day?

  24. Temperature of surfaces Darker surfaces absorb light and collect their energy and become warm. Light that is transmitted through does not get absorbed and feels cooler.

  25. Light is a wave and particle Why is light a particle? What are the particles in a light wave? Why is light a wave? What characteristics make it behave like a wave?

  26. Double Slit Experiment Wave characteristics: http://www.falstad.com/ripple/ Simulation experiment double slit: http://en.wikipedia.org/wiki/Double-slit_experiment MIT student doing double slit: http://video.mit.edu/watch/thomas-youngs-double-slit-experiment-8432/ Dr. Quantum double slit experiment: http://www.teachertube.com/viewVideo.php?video_id=50333 Or Ted talks: http://ed.ted.com/on/dCXpSQhi

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