An energy band in a solid consists of
a. an infinite number of levels, with each level corresponding to a point in a box.
b. a large number of energy levels so closely spaced that they may be regarded as a continuous band.
c. an infinite number of wave functions, with each wave function corresponding to a point in a box.
d. a large number of electrons so closely spaced that they may be regarded as a continuous band of electric charge.
e. an infinite number of electrons, with each electron corresponding to a point in a box.
b
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