The Total solution for NCERT class 6-12
Carbon, silicon and germanium have fourvalence electrons each. These are characterised by valence and conduction bandsseparated by energy band gap respectively equal to (Eg)C, (Eg)Si and (Eg)Ge. Whichof 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
The correct statement is (c).
Of thethree given elements, the energy band gap of carbon is the maximum and that ofgermanium is the least.
The energy band gap of these elements are related as: (Eg)C > (Eg)Si >(Eg)Ge