L34 - Matter - Energy - Light Lecture 34 Technicolor Atoms:...

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Lecture 34 Technicolor Atoms: Models of the atom Key Idea: Only discrete energies of light are emitted and absorbed for bound electrons. Energy of chemical reactions can be released as heat and as light. combustion of wood thermite reaction “Bodies” at higher temperature emit light of higher frequency. Matter - Energy - Light Colors of hot objects at various temperatures. T ~ 1500 K T ~ 1000 K The sun, ~ 5800 K T ~ 3000 Black body radiation spectrum http://webphysics.davidson.edu/alumni/MiLee/java/bb_mjl.htm Why is the sun “yellowish”? http://antwrp.gsfc.nasa.gov/apod/ap030207.html Rigel, 11000 K Betelgeuse, 3400 K Constellation Orion
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Black body radiation spectrum Temp. o F 100 o F ~ 300 K Only objects at 0 K do not emit radiation. Flame (CH 4 ), a high temperature medium ~ 2200 K ~ 1300 K pre-mixed air/methane ratio 0 >2 Incandescence of soot Emission by molecular fragments such as CH CH 4 + 2 O 2 ! CO 2 + 2 H 2 O " G o rxn = # 817.90 kJ/mol Na K Li Ba Flame atomic emission 1. Evaporation of water, drying
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This note was uploaded on 04/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Fall '08 term at University of California, Berkeley.

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L34 - Matter - Energy - Light Lecture 34 Technicolor Atoms:...

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