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JAMB Physics 2008 Question 49

Question 49

Electronics

When a pure semiconductor is heated, its resistance

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

Answer: B (decreases.)

Explanation

Heating frees more electrons and holes in a pure semiconductor, so more charge carriers are available and its resistance falls.