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

Explanation

The doping of one indium atom in silicon semiconductor will produce one acceptor atom in p-type semiconductor. Since one indium atom has been dropped per `5 xx 10` silicon atoms. So number density of acceptor atoms in silicon `= (5 xx 10^(28))/(5xx10^(7))=10^(21)"atom/m"^(3)=10^(15) "atom/cm"^(3)`