MSN 517 - Autumn’16-Rev.TSK.3
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Quiz 6- Solids- 18/11/2016
1. Very briefly explain the difference between direct and indirect
band gap.
In Direct Gap extrema of the valance and the conduction band are at
the same K point and in Indirect Gap extrema of the valance and the
conduction band are at different K point.
2. Write two problems of the Drude model.
It fails to explain conductivity of materials other than metals.
It fails to explain negative Hall coefficient, Magnetoresistance etc.