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In a semiconductor, separation between conduction and valence band is of the order of
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$1 \mathrm{eV}$
In conductor separation between conduction and valence bands is zero and in insulator, it is greater than $1 \mathrm{eV}$.
Hence, in semiconductor the separation between conduction and valence band is $1 \mathrm{eV}$.
Hence, in semiconductor the separation between conduction and valence band is $1 \mathrm{eV}$.
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