WAEC Physics 2025 Theory — Question 8
Question 8 of 34 from the West African Examinations Council (WAEC) Physics 2025 Theory paper, with the correct answer and a full explanation.
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8a(i) State the one condition under which a semiconductor is said to be doped. (ii) Define the terms: I. intrinsic semi-conductor II. extrinsic semi-conductor.
Model answer
(i) A semiconductor is said to be doped when impurities are deliberately added to it. (ii) I. Intrinsic semi-conductor: a pure semiconductor material, i.e. a semiconductor with an equal number of holes and electrons. II. Extrinsic semi-conductor: a semiconductor material that has been doped with impurities, so that the numbers of holes and electrons differ.
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