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Q.

What is the resistivity  of a semi conductor  if electrons density =5×1012/cm3  and Hole density = 8×1013/cm3   ( μe=2.3v−1s−1m2    and   μh=0.01v−1s−1m2)

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a

1.968 Ωm

b

0.508 Ωm

c

5.6 Ωm

d

3.4 Ωm

answer is B.

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Detailed Solution

Conductivity, σ=eneμe+nhμh=1.6×10−195×1018×2.3+8×1019×0.01=1.968Resistivity, ρ=1σ=11.968=0.508Ωm
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