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JAMB Physics 2006 Question 3

Question 3

Electronics

The theory of electronic conduction in solids, which satisfactorily explains the properties of conductors, insulators and semiconductors, is

  1. A.particle theory.
  2. B.band theory.
  3. C.group theory.
  4. D.string theory.
Show the answer and explanation

Answer: B (band theory.)

Explanation

Band theory explains conduction by the gap between the valence band and the conduction band: no gap in conductors, a small gap in semiconductors and a large gap in insulators.