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The number density of free electrons in ...

The number density of free electrons in the semiconductor is `10^18 m^-3.` It is doped with a pentavalent impurity atoms of number density `10^24 m^-3`. The number density of free electrons `m^-3` increases by a factor of

A

`4//3`

B

6

C

`10^6`

D

`10^24`.

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