Question
Physics Question on band theory of solids
The correct statement variation of the conductivity of semiconductors like Ge and Si is given by
A
Increases when it is doped with tetravalent impurity
B
Increases when it is doped with pentavalent or trivalent impurity
C
Increases when it is doped with pentavalent impurity and decreases when it is doped with trivalent impurity
D
Decreases when it is doped with pentavalent impurity and increases when it is doped with trivalent impurity.
Answer
Increases when it is doped with pentavalent or trivalent impurity
Explanation
Solution
Answer (b) Increases when it is doped with pentavalent or trivalent impurity