Astronomy 917 - Astronomy Doppler shift in light Wave = the...

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Astronomy 9/17/08 Doppler shift in light Wave = the observed wavelength (shifted) Wave-o is the emitted wavelength V is the radial velocity C is speed of light Redshift – increase in wavelength Blueshift – decrease in wavelength Dark energy? – in order to explain measurements of redshifts of supernova and expansion of the universe CHAPTER FOUR Hans Lippershey invented the telescope, Galileo made it better Collect light, bend it, focus it down - How well it does this is the focusing power Refracting Telescope – uses GLASS lenses Light moves slower in matter than in vacuum (duh) Change in speed of light causes light to bend (ie, air to glass, air to water) Refraction in the atmosphere distorts objects you see in the sky Looking straight up is less atmosphere than if out toward horizon Aka shift of stars lower on horizon is larger than shift of straight up Green flash – as sun sinks below horizon, flash of green light – caused by refraction – speed of light of diff wavelengths is slightly different
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This note was uploaded on 09/21/2008 for the course PHYS 176 taught by Professor Vahle during the Spring '08 term at William & Mary.

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Astronomy 917 - Astronomy Doppler shift in light Wave = the...

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