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![Page 1: Light and Color. Electromagnetic Spectrum Tour the electromagnetic spectrum magnetic-spectrum.html .](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649d035503460f949d6465/html5/thumbnails/1.jpg)
Light and Color
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Electromagnetic Spectrum
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Tour the electromagnetic spectrum
http://www.pbs.org/wgbh/nova/physics/electromagnetic-spectrum.html
http://missionscience.nasa.gov/ems/01_intro.html
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What is the speed of an electromagnetic wave?
All waves travel at the speed of light
3 x 108 m/s
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How does this compare to sound
Light travels faster than soundFor example fireworks and lightning
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Does anything affect the speed?
Traveling though different mediums affect speed. In what medium below does speed go the fastest and slowest? A. AirB. VacuumC. Water
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Speed of light through mediums
Through a vacuum like space?
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Speed of light through medium
Through air?
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Speed of light through medium
Through water?
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Why does this happen?
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Visible light
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How do we remember colors?
RoyGBiv video:http://vimeo.com/5377784
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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.
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Speed
C = λ fwhere c = 3 x 108 m/s
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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
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What type of wave is a light wave?
Light is an electromagnetic wave and transverse.It is a combination of electric and magnetic fields.
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Polarized Light
Why do you wear polarized sun glasses?
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Polarized lens
Demo of lenses
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Light transmission through lens
Only some light is transmitted through a polarized lens.
Transmission-light passing through a medium
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When light shines on surfaces
• Transmission-passing through of light• Reflection-light bouncing off• Absorption-light not reflecting or transmitting
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Light on surfaces
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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.
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Which surface is cooler on a sunny day?
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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.
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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?
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Double Slit Experiment
Wave characteristics:http://www.falstad.com/ripple/Simulation experiment double slit:http://en.wikipedia.org/wiki/Double-slit_experimentMIT 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=50333Or Ted talks:http://ed.ted.com/on/dCXpSQhi