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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2000

  • question_answer
    The impurity atom that should be added the germanium to make it \[n-\]type will be:

    A)  aluminium         

    B)  arsenic

    C)  indium                                

    D)  iodine

    Correct Answer: B

    Solution :

    If an impurity atom like arsenic having five valence electron is added to the germanium crystal. It will share four of the electron with germanium and the fifth electron is left free to move. Such free electrons in germanium makes it an \[n-\]type semi-conductor.


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