Light and Color. Susan Burke T.J. Sarlina. Fermilab. Tevatron, 4 miles around. Main Injector, 2 miles around. What is light?. We see light as color and brightness It’s actually electromagnetic radiation: Partly electric, partly magnetic Flows in straight line (radiates).
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4 miles around
2 miles around
We see light as color and brightness
It’s actually electromagnetic radiation:
Partly electric, partly magnetic
Flows in straight line (radiates)
Light waves can be filtered with special equipment like sunglasses.
More sets of filters can completely block light in the right combination.
We see the moon because it reflects the sun’s light
It takes 1 second for light reflected off the moon to reach the earth.
During this lunar eclipse the moon looks red because sunlight bends around the earth and blue is filtered out.
Total Lunar Eclipse – February 20, 2008
Picture courtesy of The Daily Herald
When light hits something (air, glass, a green wall, a black dress), it may be:
The waves can be reflected off the object.
The waves can be scattered off the object.
The waves can be absorbed by the object.
The waves can be refracted through the object.
Astronomers collect energy from the stars with a telescope
Radio waves, etc.
Each atom has a special pattern of light frequencies like a fingerprint
The fingerprint of frequencies will be shifted if the star is moving away or toward us (like the sound of a freight train)
The temperature of the Star can be determined from the color of the star