If the amount of impurity, either p-type or n-type, added

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If the amount of impurity, either p-type or n-type, added to the intrinsic is controlled to part in one million, the conductivity of the sample—

1. Increases by a factor of 10⁶
2. Increases by a factor of 10³
3. Decreases by a factor of 10^–3
4. Is not affected at all

Correct Option: A

Increases by a factor of 10⁶