Same chapter3 marksDifficulty: Medium
Distinguish between a half-wave and a full-wave rectifier.
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3 marksDifficulty: Medium
Distinguish between intrinsic and extrinsic semiconductors, and between n-type and p-type.
Original Khojo Papers practice question — not from a past board paper.
Answer
An intrinsic semiconductor is chemically pure, and its electrons and holes are equal in number. An extrinsic semiconductor has been doped with an impurity to increase its conductivity. Doping with a pentavalent impurity gives an n-type semiconductor in which electrons are the majority carriers; doping with a trivalent impurity gives a p-type in which holes are the majority carriers.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Both types are electrically neutral as a whole.
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