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DUMET Medical DUMET Medical Solved Paper-2010

  • question_answer
    Although carbon, silicon and germanium have same lattice structure and four valence electrons each, their band structure leads to the energy gaps as

    A) \[{{E}_{g}}(Si)<{{E}_{g}}(Ge)<{{E}_{g}}(C)\]

    B) \[{{E}_{g}}(Si)>{{E}_{g}}(Ge)<{{E}_{g}}(C)\]

    C) \[{{E}_{g}}(Si)<{{E}_{g}}(Ge)>{{E}_{g}}(C)\]

    D) \[{{E}_{g}}(Si)>{{E}_{g}}(Ge)>{{E}_{g}}(C)\]

    Correct Answer: B

    Solution :

     Band gap of silicon is 1.11 eV, of germanium is 0.67 eV and so the correct order of band gap is \[{{E}_{g}}\,(Si)>{{E}_{g}}(Ge)<{{E}_{g}}(C)\].


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