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Q.

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 (Eg)c, (Eg)si and (Eg)Ge. Which of the following statements is true?

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a

(Eg)si  < (Eg)Ge < (Eg)C

b

(Eg)C < (Eg)Ge > (Eg)si 

c

(Eg)C  = (Eg)si = (Eg)Ge

d

(Eg)C > (Eg)si  > (Eg)Ge

answer is C.

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Detailed Solution

For given elements, the energy band gap of carbon is the maximum and of germanium is the least.

(Eg)C > (Eg)si  > (Eg)Ge

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