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

(d) 

σ=eneμene=σe=6.241.6×10-19×3900=1016/cm3

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