Semiconductor Electronics: Materials, Devices and Simple Circuits
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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 (Eg)C, (Eg)Si and (Eg)Ge. Which of the following statements is true?
(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

(c) is the correct statement. 

Out of the given three elements, energy band gap is maximum for carbon, less for silicon and least for germanium.  

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