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JEE Main & Advanced Physics Semiconducting Devices Question Bank Semiconductors

  • question_answer
    The electron mobility in N-type germanium is 3900 cm2/v-s and its conductivity is 6.24 mho/cm, then impurity concentration will be if the effect of cotters is negligible

    A)            1015 cm3                                 

    B)            1013 /cm3

    C)            1012 /cm3                               

    D)            1016 /cm3

    Correct Answer: D

    Solution :

               \[\sigma =e{{n}_{e}}{{\mu }_{e}}\]  Þ\[{{n}_{e}}=\frac{\sigma }{e{{\mu }_{e}}}=\frac{6.24}{1.6\times {{10}^{-19\times 3900}}}={{10}^{16}}/c{{m}^{3}}\]


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