Fill in the blank.
Energy band gap size for insulators is in the range ________ eV.

1 - 2

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2 - 3

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3 - 4

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> 4

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Solution

The correct option is C $3 - 4$

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The conductivity of a pure semiconductor is roughly proportional to $T^{3 / 2} e^{- Δ E / 2 K T}$ where $Δ E$ is the band gap. The band gap for germanium is 0.74 eV at 4 K and 0.67 eV at 300 K. By what factor does the conductivity of pure germanium increase as the temperature is raised from 4 K to 300 K ?

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In insulators, the valence bands are completely and the large band gap prevents the promotion of electrons to empty space whereas in semiconductor band gap is low.

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Fill in the blank.Energy band gap size for insulators is in the range ________ eV.

The correct option is C 3−4

Fill in the blank.
Energy band gap size for insulators is in the range ________ eV.

The correct option is C $3 - 4$