week11 - This week Please hand in HW6 Lab report due next...

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This week Please hand in HW6 Lab report due next class for lab 5 Today we continue lab 5
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Photons Several early experiments suggested that light energies are quantized. • black body radiation spectrum (Planck) • photo electric effect (Einstein’s Nobel) • compton scattering (Compton and Debye) • photomultiplier tubes • CCD • photodiode we use this lab The quantization of light is important to consider, for example when the λ is comparable to atomic distance scales or when the number of photons is not large or when the physical dimensions are large compared to λ . Visible light can be on either side of this boundary Measure of the energy of the emerging photon
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Quantized Energies E = nhf h=6.63x10 34 Js "Planck's constant" E = n / h ω / h= h 2 π
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Photons and Atoms Stores energy to provide high voltage pulse to ionize gas Why only 1 wavelength? (well, really 2 closely spaced ones)
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Bohr model Assume that • electrons can not orbit nucleii at any arbitrary radius
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