Light3 - 8 m/s = 670 billion mph this finite speed has a...

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Light: Properties and Temperature Introduction Much of the information we get in astronomy is carried by "light" What information does "light" contain ? 1. location of light in the sky . .... gives position of a planet, moon, or star 2. color . .... gives temperature, speed and direction of motion, chemical  composition 3. brightness . .... gives distance, composition, periods of motion (from  changes) 4. size of light . .... gives size and distance information Visible light, radio waves, X-rays . . . are all different forms of the same thing => all "electromagnetic radiation" Properties of Light (electromagnetic radiation) speed of light in empty space is constant c = 3 x 10

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Unformatted text preview: 8 m/s = 670 billion mph this finite speed has a real effect on information carried by light • it takes 1 1/4 seconds for light to reach us from the moon • it takes 8 1/3 minutes for light to reach us from the sun • it takes 4 1/3 years for light to reach us from the nearest star Think of light as a wave wavelength = the distance between wave crests the wavelength is indicated by the Greek symbol " λ " in the figure above. frequency = number of wave crests per second passing a point We assume that each wave is traveling at the same speed in this figure. color is determined by wavelength (or frequency)...
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This note was uploaded on 03/09/2012 for the course AST 1002 taught by Professor Emilyhoward during the Spring '10 term at Broward College.

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Light3 - 8 m/s = 670 billion mph this finite speed has a...

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