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4 Pages

### hw13

Course: PHY 107, Fall 2009
School: Ill. Chicago
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Word Count: 1197

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13: Week Suggested Problems Note: At the atomic scale, it is most convenient to have energies in electron-volts and wavelengths in nanometers. A useful expression for the energy of a photon in terms of its wavelength is 34 8 9 19 E = hf = hc/ = (6.63 x 10 J-s)(3.00 x 10 m/s)(10 nm/m)/[(1.60 x 10 J/eV)]; 3 E = (1.24 x 10 eV-nm)/. A factor that appears in the analysis of electron energies is 9 2 2 19 2 28 ke2 =...

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