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Unformatted text preview: Announcements • Reading for Friday: 5.8 – 5.10 • Interested in becoming an LA, or simply interested in ? Go free food simply interested in ? Go to UMC, Room 235 tonight at 6pm. free food increasing energy allowed energies What do the vertical arrows represent? a. arrows on right represent absorption of light, arrows on left represent emission. b. arrows on both left and right represent emission c. arrows on both left and right represent absorption d. arrows on left represent absorption of light, arrows on right represent emission. e. I don’t know. I have never seen such a diagram. ground state increasing energy allowed energies ground state ground state d. arrows on left represent absorption of light, arrows on right represent emission. Atoms and Atomic spectra • What are atoms made off? JELL–O? • What happens when we hit atoms with various stuff? • How do atoms interact with light? Develop model of how light interacts with and is produced by individual atoms (Helps us learn how atoms ‘work’) Early ideas about atoms • Atom - Greek “indivisible unit” • The Blueberry-Muffin-Atom-Model (aka. ‘The Thomson model’): Uniform distribution of positive charges with negative electrons embedded in it. invisible! embedded in it. But wait! We can get electrons from them (scraping, chemical, or photoeffect) but no positive charges. Hmmm?!...-- Have a heavy blob that seems like grape JELL–O, and you have gun with rubber bullets. How to find out what the middle of the blob is like?...
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