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Effect of adding a small amount of impurity (doping) on a semiconductor's resistivity

The same question, asked 3 times: 16 May 2023 S2, 13 May 2024 S2, 16 Apr 2026 S1. Every wording below, oldest first.

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  1. Question 1

    16 May 2023 S2

    48
    When a small amount of impurity atoms are added to semiconductor, then generally its resistivity

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  2. Question 2

    13 May 2024 S2

    40
    Doping of a semiconductor (with small impurity atoms) generally changes the resistivity as follows.

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  3. Question 3

    16 Apr 2026 S1

    150
    When a small amount of impurity atoms are added to a semiconductor then generally its resistivity

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