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)` `Omega`m n-type silicon
(ii) `10^(-1)``Omega`m p-type silicon.
Give for silicon: `mu_(e)`=0.135`m^(2)V^(-1)s^(-1)`
and `mu_(h)`=0.048`m^(2)V^(-1)s^(-1)`.

Explanation

(i)Density of acceptor atoms in P-type Si
`N_(d)=(sigma)/(emu_(2))=(1)/(emu_(erho))=(1)/(1.6xx10^(-19)xx0.13xx10^(-1))`