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NEET Sample Paper NEET Sample Test Paper-4

  • question_answer
    What is conductivity of a semiconductor? If electron density is \[5\times {{10}^{12}}\] per \[c{{m}^{3}}\]and hole density is \[8\times {{10}^{13}}\] per\[c{{m}^{3}}\]. (\[\mu e=2.3\,{{V}^{-1}}{{s}^{-1}}{{m}^{2}}\]and \[\mu h=0.0{{N}^{-1}}{{s}^{-1}}{{m}^{2}}\])

    A)  \[5.634e\,{{\Omega }^{-1}}{{m}^{-1}}\]          

    B)  \[1.968\,{{\Omega }^{-1}}{{m}^{-1}}\]

    C)  \[3.421\,{{\Omega }^{-1}}{{m}^{-1}}\]            

    D)  \[8.964\,\,{{\Omega }^{-1}}{{m}^{-1}}\]

    Correct Answer: B

    Solution :

    As conductivity of semiconductor, \[\sigma =e({{n}_{e}}{{\mu }_{e}}+{{n}_{r}}{{\mu }_{n}})\] \[=1.6\times {{10}^{-19}}(5\times {{10}^{18}}\times 23+{{810}^{19}}\times 0.01)\] \[=1.968\,{{\Omega }^{-1}}{{m}^{-1}}\]


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