AY 101 - SEPT 20 LECTURE NOTES
AY 101 - SEPT 20 LECTURE NOTES AY 101
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This 2 page Class Notes was uploaded by Savannah L on Tuesday September 20, 2016. The Class Notes belongs to AY 101 at University of Alabama - Tuscaloosa taught by Jeremy Bailin in Spring2015. Since its upload, it has received 15 views. For similar materials see AY 101 - Intro to Astronomy - Jeremy Bailin in Astronomy at University of Alabama - Tuscaloosa.
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Date Created: 09/20/16
LECTURE – SEPT 20 White light – reflects all colors Spectrums— [Kirchoff’s Laws] 1. Continuous Spectrum HOT DENSE MATERIAL INTENSITY 2. Emission Line Spectrum HOT DIFFUSE GAS INTENSITY 3. Absorption Line Spectrum COOL DIFFUSE GAS IN FRONTOF NOT DENSE INTENSITY MATERIAL Temperature is a measurement of thermal energy o As temperature increases, particles begin to move quicker o Blue photons have more energy than red photons (blue fire hotter than red) o Higher energy = shorter wavelength = higher temperature o Lower energy = longer wavelength = lower temperature Diffuse Gas – photons interact with individual atoms Dense Material – photons interact with ensembles of atoms Negative electrons orbit around positive nucleus, electromagnetic attraction instead of gravity Can only orbit at fixed energy levels that are quantized (discrete) 3 EXCITED LEVEL ND 2 EXCITED LEVEL p+ 1 EXCITED LEVEL GROUND STATE Chemical Fingerprints – The energy levels of the atom depend on the element The wavelengths of the lines tell you what the gas is made out of Vary from element to element Electromagnetic energy is different when you have different numbers of protons and electrons
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