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Statement 1: Band gap in germanium is small. Statement 2 : The energy spread of each germanium atomic energy level in infinitesimally small.

$(A)\;\text{Statement -1 is true ; Statement -2 is true. Statement -2 is a correct explanation for statement -1} \\ (B)\;\text{Statement -1 is true ; Statement -2 is true. Statement -2 is not a correct explanation for statement -1} \\(C)\;\text{Statement -1 is true ; Statement -2 is false.} \\(D)\;\text{Statement -1 is false ; Statement -2 is true.} $
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Germanium is a semiconductor , Where the energy gap between adjacent bands is sufficiently small for thermal energy to be able to promote a small number of electrons form the full valence band to the empty conduction base.
This leaves both bands partially filled.
So the material can conduct electricity .
Hence b is the correct answer.
answered Apr 4, 2014 by meena.p
 

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