Question

Carbon, silicon and germanium have four valence electrons each. These are characterized by valence and conduction bands separated by energy band gap respectively equal to $\left( E_{g} \right)c,\left( E_{g} \right)si$ and $\left( E_{g} \right)Ge,$ which of the following statements is true?

• A. $\left( E_{g} \right)_{si} < \left( E_{g} \right)_{Ge} < \left( E_{g} \right)_{c}$
• B. $\left( E_{g} \right)_{C} < \left( E_{g} \right)_{Ge} < \left( E_{g} \right)_{Si}$
• C. $\left( E_{g} \right)_{C} > \left( E_{g} \right)_{Si} > \left( E_{g} \right)_{Ge}$
• D. $\left( E_{g} \right)_{C} = \left( E_{g} \right)_{Si} = \left( E_{g} \right)_{Ge}$

Answer 1

Answer: (C)

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

Answer 2

: $(E_{g})_{c} > (E_{g})_{si} > (E_{g})_{Ge}$