electromagnetic waves
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Speed of Light
• The speed of light (variable c) is 3 X 10 8 m/s. This is true for the whole
electromagnetic spectrum.
Using a Classroom Projector to Study the Properties of Light
Drs. Michael Ottinger and Brian BuckleinMissouri Western State University
St Joseph, MO 64507
Missouri Association of Physics Teachers MeetingNovember 6, 2010
Three Color Image System
Red Image
Blue Image
Green Image
Superimpose Images
Red Lamp
Blue Lamp
Green Lamp
Breaking down the Colors
• The following slides were made by using the “Shapes” drop down in PowerPoint to make two thin rectangular lines.
• The top line was set to white and, using the color setting the bottom line was set to different color combinations.
A question
• Winnie the Pooh (the yellow skinned bear) is placed under red light. How will he appear?
Intensity of Light
• Transparent– Light Completely passes through (Glass,
transparency
TranslucentLight partially passes through (frosted glass)
OpaqueLight completely blocked.
Microwaves (High wavelength)
• Used for communication and to cook food.
• Microwaves work by resonating water molecules.
• Do not put foil in the microwave!
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