Lecture 2

Lecture 2 - Lecture 2- Tuesday, January 26, 2010 Properties...

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Lecture 2- Tuesday, January 26, 2010 Properties of Light Class Vote Question 1. If you observe the spectrum of the Sun from the ground, what do you see? An uninterrupted continuous spectrum An emission line spectrum An absorption line spectrum 1. The Shape of the Spectrum a. The shape of a spectrum can often be modeled well as that of a "black body" a.i. Black body reflects no light a.i.1. A black body doesn't really exist, but is used because its easy to work with a.i.1. Spectrum of something that doesn’t reflecting any light a.i.1. Stars don't reflect much light from nearby stars, the light they emit is a glow from heat a.i. Only radiation is due to a black body temperature a.i. Hotter black bodies are more blue and brighter a. Absolute (Kelvin) a.i. 0K really means zero - cannot be colder a.i. Degrees same size as Celcius scale a.i. 0 C = 273 K = freezing point of water 1. The Spectrum of the Sun - Again a. The spectrum of the Sun is not a black body, it has absorption lines (but often it is
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This note was uploaded on 03/30/2012 for the course ASTR 1102 taught by Professor Staff during the Spring '08 term at LSU.

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Lecture 2 - Lecture 2- Tuesday, January 26, 2010 Properties...

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