Find the number density of impurity atoms that must be added to a pure silicon crystal inorder to convert it to have resistivity (i) `10^(-1)Omegam` n-type silicon (ii) `10^(-1)Omegam` p-type silicon. Give for silicon: `mu_(e)=0.135m^(2)V^(-1)s^(-1)`
and `mu_(h)=0.048m^(2)V^(-1)s^(-1)`.