Carbon, Silicon and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (E g) C , (E g) Si and (E g) Ge respectively. Which one of the following relationships is true in their case

1. A. (E g) C<(E g) Ge
2. B. (E g) C>(E g) Si
3. C. (E g) C=(E g) Si
4. D. (E g) C<(E g) Si

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