Electrical Engineering Material

Calculate the resistance of pure silicon cubic crystal of $1\ \mathrm{cm^3}$ at room temperature. What will be the resistance of the cube when it is doped with $1$ arsenic in $10^9$ silicon atoms and $1$ boron atom per billion silicon atoms? Atomic concentration of silicon is $5\times10^{22}\ \mathrm{cm^{-3}}$, $n_i=1.45\times10^{10}\ \mathrm{cm^{-3}}$.