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Q.

The conductivity of semi conductors like Si or Ge

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a

Increases when it is doped with tetravalent impurity

b

Increases when it is doped with trivalent impurity and decreases when it is doped with pentavalent impurity

c

Increases when it is doped with trivalent or pentavalent impurity

d

Increases when it is doped with pentavalent impurity and decreases when it is doped with trivalent impurity

answer is C.

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Detailed Solution

Increases when it is doped with trivalent or pentavalent impurity
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