Lecture03.doc - Lecture3

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Lecture 3 The light we see with our eyes, visible light, or optical light is only one small part of  the entire spectrum of light.                            The Electromagnetic Spectrum   In order of increasing wavelength           - Gamma Rays - X Rays         - Ultraviolet light         - Visible light         - Infrared light         - Radio Waves   Each kind of light is defined by the methods we use to actually observe it (i.e. detect it).   Visible light covers only a very small portion of the spectrum. On the diagram of the spectrum shown in class, visible light corresponds to one part in 43.  That is, there are 43 separate intervals equal to the interval covered by light that covers the spectrum as shown.   It is nevertheless an important interval because it is the interval where most stars, in particular the Sun, give off most of their energy.   
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This note was uploaded on 03/02/2011 for the course ASTRO 10 taught by Professor Norm during the Spring '06 term at University of California, Berkeley.

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Lecture03.doc - Lecture3

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