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Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated energy band gaps represented $\left(E_g\right)_C,\left(E_g\right)_{S i}$, and $\left(E_g\right)_{G e}$ respectively. Which one of the following relationship is true in their case?
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Verified Answer
The correct answer is:
$\left.\left(\mathrm{E}_g\right)_{\mathrm{C}}>\mathrm{E}_g\right)_{\mathrm{Si}}$
Band gap of carbon is $5.5 \mathrm{eV}$ while that of silicon is $1.1 \mathrm{eV}$
$$
\left(E_g\right)_C>\left(E_B\right)_S
$$
$$
\left(E_g\right)_C>\left(E_B\right)_S
$$
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