Multiple choice

N-type semi conductors are obtained by adding impurities to pure germanium. The impurities have to be

  1. monovalent

  2. trivalent

  3. tetravalent

  4. pentavalent
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

N-type semiconductors are created by doping a tetravalent semiconductor (like germanium) with pentavalent impurities (like phosphorus or arsenic) to provide extra electrons.

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