In semiconductors, at room temperature
(a) the conduction band is completely empty
(b) the valence band is partially empty and the
conduction band is partially filled
(c) the valence band is completely filled and the
conduction band is partially filled
(d) the valence band is completely filled
Solution: In semiconductors, the conduction band is
empty and the valence band is completely filled at 0 K.
No electron from valence band can cross over to
conduction band at 0K. But at room temperature some
electrons in the valence band jump over to the conduction
band due to the small forbidden gap, i.e. 1 eV.
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