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Q.

Carbon, silicon and germanium atoms have four valence electrons each.  Their valence and conduction bands  are separated by energy band  gaps  represented  by  (Eg)C, (Eg)siand (Eg )Ge,respectively. Which one of the following relationship is true in their case?

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a

(Eg)C< (Eg)si

b

(Eg)C= (Eg)si

c

(Eg)C> (Eg)si

d

(Eg)C< (Eg )Ge,

answer is A.

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Detailed Solution

Forbidden energy gap for carbon is greater than that of silicon.

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Carbon, silicon and germanium atoms have four valence electrons each.  Their valence and conduction bands  are separated by energy band  gaps  represented  by  (Eg)C, (Eg)siand (Eg )Ge,respectively. Which one of the following relationship is true in their case?