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JAMB Physics 2005 Question 4

Question 4

Electronics

When impurities are added to semi-conductors, the conductivity of the semi-conductor

  1. A.remains constant.
  2. B.increases then decreases.
  3. C.increases.
  4. D.decreases.
Show the answer and explanation

Answer: C (increases.)

Explanation

Doping adds extra free electrons or holes, so the semiconductor conducts better.