Chemistry 4 Friday, September 1, 2006

Chemistry 4 Friday, September 1, 2006 - Friday, September...

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Friday, September 01, 2006 Chemistry I’VE SEEN THE LIGHT How do we characterize light? What does light tell us about the inside of atoms? Text: Sections 2.0-2.3 LIGHT 1. Light as a wave a. Speed of light(c) i. 3.0 x 10 8 m/s for all light c = λ υ b. Wavelength (λ) i. Distance between peaks (1nm=10 -9 m) c. Frequncy (υ) i. How many peaks pass by per second Wavelength Violet 400 nm Orange 600 nm Frequency Violet = smaller wavelength = larger frequency 2. Light as a particle a. Photo electric effect i. e- ejected if light above certain frequency (not dependent on intensity) ii. Light is quantized comes in unity’s called photons iii. Each photon has energy E = h υ h: planks constant
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Friday, September 01, 2006 ATOMIC SPECTRA 1. H spectrum (figure 2.4 in text book) a. υ = const (1/2 2 - 1/n 2 ) n= 2,4,5,6 for UV = 2 1 for IR=2 3 (referring to exponents) 2. Similar relationship for any species with one e- E=Z 2 hR(1/n 2 low - 1/n 2 high ) Charge on Plank’s Rydberg Nucleus Constant
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This note was uploaded on 03/20/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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Chemistry 4 Friday, September 1, 2006 - Friday, September...

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