Chemistry

Problem

14.3 Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to

\left(E_{\mathrm{g}}\right)_{\mathrm{C}},\left(E_{\mathrm{g}}\right)_{\mathrm{Si}}

and

\left(E_{\mathrm{g}}\right)_{\mathrm{Ge}}

. Which of the following statements is true? (a)

\left(E_{g}\right)_{\mathrm{Si}}<\left(E_{g}\right)_{\mathrm{Ge}}<\left(E_{g}\right)_{\mathrm{C}}

(b)

\left(E_{g}\right)_{\mathrm{C}}<\left(E_{g}\right)_{\mathrm{Ge}}>\left(E_{g}\right)_{\mathrm{Si}}

(c)

\left(E_{g}\right)_{\mathrm{C}}>\left(E_{g}\right)_{\mathrm{Si}}>\left(E_{g}\right)_{\mathrm{Ge}}

(d)

\left(E_{g}\right)_{\mathrm{C}}=\left(E_{g}\right)_{\mathrm{Si}}=\left(E_{g}\right)_{\mathrm{Ge}}

(a)

\left(E_{g}\right)_{\mathrm{Si}}<\left(E_{g}\right)_{\mathrm{Ge}}<\left(E_{g}\right)_{\mathrm{C}}

(b)

\left(E_{g}\right)_{\mathrm{C}}<\left(E_{g}\right)_{\mathrm{Ge}}>\left(E_{g}\right)_{\mathrm{Si}}

(c)

\left(E_{g}\right)_{\mathrm{C}}>\left(E_{g}\right)_{\mathrm{Si}}>\left(E_{g}\right)_{\mathrm{Ge}}

(d)

\left(E_{g}\right)_{\mathrm{C}}=\left(E_{g}\right)_{\mathrm{Si}}=\left(E_{g}\right)_{\mathrm{Ge}}

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