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Mobility of electron in N-type Ge is 500...

Mobility of electron in N-type Ge is `5000 cm^(2)//"volt"` sec and conductivity `5 "mho/cm"`. If effect of holes is negligible then impurity concentration will be

A

`6.25 xx 10^(15)//cm^(3)`

B

`9.25 xx 10^(14)//cm^(3)`

C

`6 xx 10^(13)//cm^(3)`

D

`9 xx 10^(13)//cm^(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
`sigma=en_(e)mu_(e)`
`rArr n e=(1)/(emu_(e))=(5)/(1.6xx10^(-19)xx5000)=6.25xx10^(15)cm^(-3)`
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