The intrinsic germanium conductivity at 270 is 2.13 mho mand mobility of electron and holes are 0.38 and 0.18 m2v−1s−1 respectively. The density of charge carriers is
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a
8.9×1013/m3
b
2.5×1019/m3
c
2.37×1019/m3
d
3.7×1019/m3
answer is C.
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Detailed Solution
In intrinsic semi conductor, ne=nh=niConductivity, σ=nieμe+μn⇒ni=σeμe+μh=2.131.6×10−19(0.38+0.18)⇒ni=2.13×10191.6×0.56=2.37×1019/m3