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NEET AIPMT SOLVED PAPER SCREENING 2005

  • 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 \[({{E}_{g}}){{G}_{Ge}}\] 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.                 \[{{({{E}_{g}})}_{C}}=5.2\,eV\]                 \[{{({{E}_{g}})}_{Si}}=1.21\,eV\]                 \[{{({{E}_{g}})}_{Ge}}=0.75\,eV\]                 Thus, \[{{({{E}_{g}})}_{C}}>{{({{E}_{g}})}_{Si}}\,and\,\,{{({{E}_{g}})}_{C}}>{{({{E}_{g}})}_{Ge}}\]                 Note:    Elements carbon, silicon and germanium are found in IVA group of periodic table.


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