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Question
Which band-gap range characterizes insulators?
Options
\[E_g=0.7\ \mathrm{eV}\]
\[E_g<3\ \mathrm{eV}\]
\[E_g\approx 0\ \mathrm{eV}\]
\[E_g>3\ \mathrm{eV}\]
MCQ
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Solution
Insulators have a very large energy gap, \[E_g>3\ \mathrm{eV}\]. Room-temperature thermal energy is far too small to excite electrons across it.
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