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BHU PMT BHU PMT (Screening) Solved Paper-2006

  • question_answer
    Carbon, silicon and germanium have four valence   electrons   each.   These   are characterized valence and conduction bands separated by energy band gap respectively equal to\[{{(Eg)}_{C}},{{(Eg)}_{Si}}\]and\[{{(Eg)}_{Ge}}\]. Which of the following statements is true?

    A)  \[{{(Eg)}_{C}}={{(Eg)}_{Si}}={{(Eg)}_{Ge}}\]

    B)  \[{{(Eg)}_{C}}>{{(Eg)}_{Si}}>{{(Eg)}_{Ge}}\]

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

    D)  \[{{(Eg)}_{Si}}<{{(Eg)}_{Ge}}>{{(Eg)}_{C}}\]

    Correct Answer: B

    Solution :

                     Carbon , germanium (Ge) and silicon (Si) are semiconductros. They lie in 1VA group of periodic table. \[{{(Eg)}_{C}}=5.2eV\] \[{{(Eg)}_{Ge}}=0.75eV\] \[{{(Eg)}_{Si}}=1.21eV\] Thus, it is obvious that                 \[{{(Eg)}_{C}}>{{(Eg)}_{Si}}>{{(Eg)}_{Ge}}\]


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