Consider the energy E in the first Brillouin zone as a function of the magnitude of the wave vector k for a crystal of lattice constant a. Then: O A. The slope of E versus k is proportional to the group velocity O B. O C. The slope of E versus k has its maximum value at |k|=- The plot of E versus k will be parabolic in the internal π D. The slope of E versus k is non-zero for all k the interval a A -<|k|< = a a --
Consider the energy E in the first Brillouin zone as a function of the magnitude of the wave vector k for a crystal of lattice constant a. Then: O A. The slope of E versus k is proportional to the group velocity O B. O C. The slope of E versus k has its maximum value at |k|=- The plot of E versus k will be parabolic in the internal π D. The slope of E versus k is non-zero for all k the interval a A -<|k|< = a a --
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Transcribed Image Text:QUESTION 49
Consider the energy E in the first Brillouin zone as a function of the magnitude of the wave vector k for a crystal of lattice constant a. Then:
OA. The slope of E versus k is proportional to the group velocity
OB.
OC.
The slope of E versus k has its maximum value at |k|=
The plot of E versus k will be parabolic in the internal
D.
The slope of E versus k is non-zero for all k the interval
T
Cl
=
<<|| <= 12
a
<k
<*(#)
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