Practice II Mid Term Spring 2018.pdf

Practice II Mid Term Spring 2018.pdf - Practice II Mid Term...

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Practice II Mid Term Fall 2017 Closed Book MSE 221 II MID TERM (11/13/15) 50 minutes 1. A certain crystal is cut so that rows of atoms on its surface separated by a distance of act like a diffraction grating. A beam of electrons is accelerated through a potential difference of and is incident normally on the surface. (a) Calculate how many possible diffraction order peaks will be observed from the surface and at what angles relative to the incident beam will these be observed? (b) Draw a rough sketch of the intensity distribution you expect from this set-up. ( 5 + 5 + 5 = 15 points ) 2. (a) What does the acronym LASER represent? (b) Give a pictorial representation of the quantum mechanical optical transitions possible between two states of a system with different energies. (c) Give a statement of Heisenberg’s uncertainty principle in words and express it mathematically as it applies to the energy and lifetime of a particle emitted during an atomic transition.
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  • Spring '15
  • Diffraction, wave function, Excited state, TDSE, optical transitions

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