A) \[{{E}_{g}}\] (diamond) \[>{{E}_{g}}\] (silicon) \[>{{E}_{g}}\] (germanium)
B) \[{{E}_{g}}\] (diamond) \[<{{E}_{g}}\] (silicon) \[<{{E}_{g}}\] (germanium)
C) \[{{E}_{g}}\] (diamond) \[={{E}_{g}}\] (silicon)\[={{E}_{g}}\] (germanium)
D) \[{{E}_{g}}\] (diamond) \[>{{E}_{g}}\] (germanium) \[>{{E}_{g}}\] (silicon)
Correct Answer: A
Solution :
The energy gaps \[({{E}_{g}})\] between valence band and conduction band for diamond, silicon and germanium are in the order \[{{E}_{g}}\] (diamond) \[>{{E}_{g}}\] (silicon) \[>{{E}_{g}}\] (germanium) Because diamond is an insulator and non-metallic character decreases down the group.
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