06_Bohr through Heisenberg

06_Bohr through Heisenberg - The Character of Electrons...

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The Character of Electrons Photoelectric Effect Diffraction through a double slit Emission spectra of atoms Heisenberg Uncertainty Principle Emission Spectrum for Neon
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Photoelectric Effect High intensity, long wavelength light cannot eject electrons from a metal plate. Only light with a minimum threshold frequency can result in the emission of electrons from a metal. Therefore, only light with sufficient energy can meet the threshold frequency of the metal, and light is quantized in discrete energy units called photons. c = λν E = h ν where h is Planck’s constant, 6.626 × 10 −34 J-s
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Diffraction behavior of electrons If electrons behave only like particles, there should be only two bright spots on the target.
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Electrons produce an interference pattern However, electrons actually present an interference pattern, demonstrating they behave like waves .
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. The electrons generate an interference pattern due to their wave-like properties.
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Wave Behavior of Electrons Louis de Broglie (1892–1987) de Broglie proposed that particles could have a wavelike character. de Broglie predicted that the wavelength of a particle is inversely proportional to its momentum. Because it is so small, the wave character of electrons is significant.
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Practice: de Broglie relation Wavelength (m) Mass (kg) Velocity (m/s) Electron 9.11x10 -31 2.65 x 10 6 Baseball 0.145 40.23 h=6.626 x 10 -34 J∙s.
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Hg He H When atoms or molecules absorb energy, that energy is often released as light energy. Emission Spectrum for Neon
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This note was uploaded on 11/08/2011 for the course CHM 2045 taught by Professor Geiger during the Fall '08 term at University of Central Florida.

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06_Bohr through Heisenberg - The Character of Electrons...

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