p7 - Goals Goals Fromlightwelearnabout Composition Motion...

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Goals Goals • From light we learn about – Composition – Motion
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Continuum Spectra •A Continuum Spectrum: Light emitted across a  continuous range of  wavelengths. •A thermal spectrum is a  continuum spectrum. But what are these? The Sun
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A Spectrum • A spectrum = the amount of light given off by an  object at a range of wavelengths. Emission lines Absorption lines Continuum
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Continuum Concept Test The sun shines on a cold airless asteroid made of  black coal. What light from the asteroid do we  detect? a. No light at all. a. Some reflected visible light. a. Some reflected visible, plus emitted visible light. a. Some reflected visible, plus emitted infrared light. a. Some reflected visible, plus emitted visible and emitted  infrared light. 
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Spectral Line formation? • Electron has  different energy  levels:  Floors in a  building . • Lowest is called the  Ground State . • Higher states are  Excited States .
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Changing Levels • If you add the RIGHT amount of energy to an  atom, the electron will jump up energy floors. • If the electron drops down energy floors, the atom  gives up the same amount energy. • From before, LIGHT IS ENERGY:  E = hc/ λ
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Kirchhoff’s Laws Light of all wavelengths shines on an atom. Only light of an energy equal to the difference between 
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This note was uploaded on 02/12/2011 for the course PHY 2004 taught by Professor Staff during the Spring '08 term at University of Florida.

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p7 - Goals Goals Fromlightwelearnabout Composition Motion...

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