The energy gap between conduction band and the valence band is of

Subject

Physics

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

71.

A photodetector used to detect the wavelength of 1700 nm, has energy gap of about

  • 0.073 eV

  • 1.2 eV

  • 0.73 eV

  • 1.16 eV


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72.

The energy gap between conduction band and the valence band is of the order of 0.7 eV. Then it is

  • an insulator

  • a conductor

  • a semiconductor

  • an alloy


C.

a semiconductor

It is a semiconductor,

For Ge,    ΔEg = 0.72 eV

For Si,      ΔE= 1.1 eV


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