9. A low-level injection process in a p-type semiconductor doubles the number of free elec- trons. After the injection is stopped, how long will it take for the number of electrons to fall within 1% of their thermal equilibrium value? Assume a minority carrier lifetime of 1 millisecond. 10. At some instant of time under nonequilibrium conditions, a nondegenerate silicon semi- conductor at room temperature has these quasi-Fermi levels: FNE+0.1 eV, and Fp = E - 0.1 eV. Find the electron and hole concentrations (/cm).