A silicon specimen is made into a P-type...

A silicon specimen is made into a `P`-type semiconductor by dopping, on an average, one helium atoms per `5xx10^(7)` silicon atoms. If the number density of atoms in the silicon specimen is `5xx10^(28) at om//m^(3)` then the number of acceptor atoms in silicon per cubic centimeter will be

`2.5xx10^(20)" atom cm"^(-3)`

`2.5xx10^(25)" atom cm"^(-3)`

`1xx10^(13)" atom cm"^(-3)`

`1xx10^(15)" atom cm"^(-3)`

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