1.22 Astro 1 - Astro 1 Section 1 Professor Brandt Friday...

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Astro 1 Section 1 Professor Brandt Friday January 22nd 1999 Announcements: Lecture notes: Class 6. Today we will answer several important questions How is light made? How fast is light? How can light have different colors? How do we perceive colors and what do they mean in terms of properties of light? Is there "light" beyond the end of the rainbow that we can't see? How to we detect radiation that is invisible to our eyes? How is light made? made when particles with an electric charge move around (elections) light from galaxies is made when charged particles in these galaxies move around. In a rough sense you can see objects with higher temperatures will emit more energy. Charged particles in a system with high T will move more and thus make more light Also of course larger things can emit more light than smaller things. More charged particles to move around. How fast is light? light in a vacuum always travels at the same speed no matter what color it is
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