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A Si specimen is made into p-type semico...

A Si specimen is made into `p`-type semiconductor by doping on an average one indium atom per `6 xx 10^7` silicon atoms. If the number density of atoms in Si be `6 xx 10^28//m^3`, the indium atoms per `cm^3` are

A

`10^12`

B

`10^15`

C

`10^18`

D

`10^20`.

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