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DUMET Medical DUMET Medical Solved Paper-2006

  • question_answer
    Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by \[{{({{E}_{g}})}_{C}},\]\[{{({{E}_{g}})}_{Si}}\] and\[{{({{E}_{g}})}_{Ge}}\] respectively. Which one of the following relationships is true in their case?

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

    B)  \[{{({{E}_{g}})}_{C}}={{({{E}_{g}})}_{Si}}\]

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

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

    Correct Answer: A

    Solution :

     Carbon, silicon and germanium are semiconductors. \[{{({{E}_{g}})}_{C}}=5.2\,eV\] \[{{({{E}_{g}})}_{Si}}=1.21\,\,eV\] \[{{({{E}_{g}})}_{Si}}=1.21\,\,eV\] Thus, \[{{({{E}_{g}})}_{Si}}=1.21\,\,eV\] and \[{{({{E}_{g}})}_{C}}>{{E}_{g}}{{)}_{Ge}}\] Note: Elements carbon, silicon and germanium are found in IVA group of periodic table.


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