In a semiconducting material 1/5th of the total current is carried by the holes and The remaining is carried by the electrons. If the drift speed of electrons is twice that of holes at this temperature the ratio of number densities of electrons and holes is

Dear Student
using formula of drift speed vd =ineAn=ivdeAorn=ivdnenh=ievdeihvdh=4i5×2vi5v1  =21Regards

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