In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of
  • A$1\  MeV$
  • B$0.1 \ MeV$
  • C$1\   eV$
  • D$5\  eV$
[DPMT 1988; EAMCET (Engg.) 1995; MP PET 1996]
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