Chapter 6

Chapter 6 - Of atoms =arrangement of electrons in the atom...

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Of atoms =arrangement of electrons in the atom 1. Radiation that carries E through space 2. EMR is characterized by wavelength nature See figure 6.2 N (nu) = # of cycles that pass a point in space /s Hertz(Hz) 1Hz = 1s-1 N (frequency) * wavelength = C (speed of light) C = 3.00 X 10 8 m/s Wavelength distribution depends on temp. "red hot" vs. "white hot" emit different wavelengths Proposal: E can only be absorbed or emitted from atoms in certain amounts = Quanta Quantum = smallest amount of E emitted or absorbed Related E to frequency. E= hn or 6.626 X 10-34 J*S X frequency
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Provides evidence for the particle nature of light and quantization Ephoton = hn Planck n*l = C, n = (C/l) n=frequency, l =wavelength E=mc2 1/c * mc= h (c /l) * 1/c = mc = h/l l = h/(mc) e- are only ejected if sufficient E Below "threshold frequency" ->no e- emitted Above "threshold frequency" -> e- emitted 1. Light has wave-like and particle nature monochromatic continuous Ex. Rainbow: continuous spectrum of light Gases in vacuum, turn on voltage
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This note was uploaded on 04/01/2008 for the course CHEM 101 taught by Professor Farahh during the Fall '02 term at UNC.

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Chapter 6 - Of atoms =arrangement of electrons in the atom...

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