08 - intensity in green. The W filament in an incandescent...

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Stressed about upcoming prelims? Want to do well in your classes this semester? Wish you knew better study techniques? Worry no more… HELP IS HERE! Prelim Prep: Study Smarter, Not Harder Questions? Contact Mike Chen: [email protected] Sponsored by the Learning Strategies Center. Wednesday, September 23 4:30–5:30 pm Room 3330 Carol Tatkon Center
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Tours will meet at 5pm on Tuesday, September 22 behind Fernow For more information about Friends of the Gorge visit: plantations.cornell.edu or e-mail sjs299 Explore the Gorges! Join Friends of the Gorge on a tour of Cornell’s gorges. Experience the beauty of Fall while learning about one of Cornell’s most unique resource
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Lecture 8 Æ Review of Lecture 7: E M waves: λν = c (3.00 x 10 8 m/s) Visible radiation only 700 nm (red) to 400 nm (violet), yet 40 % of sun’s energy at earth’s surface is in the visible. Black body radiation is continuous as a function of λ . Sun’s radiation is mostly black body type (5800 K), peak
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Unformatted text preview: intensity in green. The W filament in an incandescent light bulb is near 3000 K, looks yellow, but 99 % of radiation is in the IR (heat). Heated gasses (> 2000 K), gas discharge lamps and solids that vaporize show line emission at very specific wavelengths only , not black body radiation. Balmer finds that the emission from a H discharge lamp in the visible and near UV part of the spectrum fits a simple equation: = (1/2 2 1/n 2 ), with n integer 3, to 5 sig figs (experimental error at the time)! Radiation from other excited gasses also have line spectrum, but does not fit such a simple equation. Why? How to explain that the radiation is not black body type? Assignments: Finish reading Chapter 8 Assignment #4 now posted on MC.com. Due Saturday 9/26 at 6:00 pm NO written home work to pass in next week....
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This note was uploaded on 09/29/2009 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell University (Engineering School).

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08 - intensity in green. The W filament in an incandescent...

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