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What should be the order of number densi...

What should be the order of number density of donor atoms to obtain an N semiconductor of conductivity `5 S cm^-1`. The mobility of electrons is `4000 cm^2//Vs` and the number density of holes is negligible.

A

`10^10 cm^-3`

B

`10^14 cm^-3`

C

`10^16 cm^-3`

D

`10^22 cm^-3`.

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