EE372_Assignment2 - EE372 Assignment 2 due Sept. 29, 2010...

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EE372 Assignment 2 due Sept. 29, 2010 in class You should read Chapters 3.2 through 3.4 of the textbook and review your lecture notes on Bohr’s model of the hydrogen atom and then answer the following questions. 1. DeBroglie waves a) Certain scientific installations produce so-called thermal neutrons for neutron diffraction experiments. Such neutrons are in thermal equilibrium with their surroundings so their average kinetic energy is (3 / 2) kT where T is room temperature, 300K. Calculate the average energy (in eV) and the DeBroglie wavelength for a neutron with that energy. Why do you think thermal neutrons are useful for diffraction experiments on materials? The mass of a neutron is 1 . 675 × 10 - 27 kg. b) An electron and a photon both have a wavelength of 500 nm. Calculate the energy (in eV) and the momentum for each. The momentum of a photon is given by h/λ . c) An electron and a photon both have an energy of 1 eV. Calculate the momentum of each. Notice how small the momentum of the photon is compared to the electron. This fact
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EE372_Assignment2 - EE372 Assignment 2 due Sept. 29, 2010...

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