The conductivity of semiconductors like Ge and Si

Options :
  1. increases when it is doped with tetravalent impurity
  2. increases when it is doped with pentavalent or tirvalent impurity
  3. increases when it is doped with pentavalent impurity and decreases when it is doped with trivalent impurity
  4. decreases when it is doped with pentavalent impurity and increases when it is doped with trivalent impurity
Answer and Explanation :-

Answer: Option 2

Explanation:

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