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Question

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)Si,(Eg)c 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

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Solution

The energy bandgap for
Carbon (Diamond), Eg5.5eV
Silicon Eg1.14eV
Germanium Eg0.67eV

Out of carbon, germanium, and silicon, carbon has the maximum energy bandgap whereas germanium has the least energy bandgap.
(Eg)C>(Eg)Si>(Eg)Ge
Final Answer : (C).

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