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 dopped per `5 times 10^(7)` silicon atoms, so number density of acceptor atoms in silicon
`=(5 times10^(28))/(5 times 10^(7))=10^(21) " atom"//m^(3)=10^(15) " atoms"//cm^(3)`