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JAMB Physics 2000 Question 39

Question 39

Electronics

In a pure semiconductor, the number of electrons in the conduction band is

  1. A.equal to the number of holes in the valence band
  2. B.greater than the number of holes in the valence band
  3. C.less than the number of holes in the valence band
  4. D.twice the number of holes in the valence band.
Show the answer and explanation

Answer: A (equal to the number of holes in the valence band)

Explanation

In a pure (intrinsic) semiconductor each electron that jumps to the conduction band leaves one hole behind, so the numbers are equal.