PHYSICS 141A Final: physics141A-fa2007-final-Instructor-exam
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Final exam, l3th of decemberr 2o0t h:7. 054 x 10-34 js rrte :9. 11 x 10-31 kg lel : 1. ooz x 10-1e c. 1" (20 points) consider the free electron gas model for metals. 5b: :p. o t) (20 points) binding in simple metals such as na arises from the lowering of kinetic energy of valence eiectrons when the atoms are brought together. L = i"/" . o: assuming one valence electron per atom, show that the cohesive energy per atom is approximately given by. : 0. 193g - 0. 2. 1: on the basis of this model, estimate the cohesive energy of simple metals. 3" (20 points) consider the first brillouin zone of a crystal with a simpie hexagonai lattice in three dimensions with lattice constants a and c. let g" denote ttre shortest reciprocal. " with two sides 1 * r tfr. "f nanometric wire in the form of a.
