1.

The conductivity of semi conductors like Si or Ge

Answer»

Increases when it is doped with tetravalent IMPURITY
Increases when it is doped with trivalent impurity and DECREASES when it is doped with PENTAVALENT impurity
Increases when it is doped with trivalent or pentavalent impurity
Increases when it is doped with pentavalent impurity and decreases when it is doped with trivalent impurity

ANSWER :C


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