KCET 2018 Physics Solved Paper

Given, density of electron-hole pair in pure germanium =3×1016m−3
On doping, hole density =4.5×1022m−3
Electron density = ?
We know n12=nhne
Where ni is electron–hole density in pure semiconductor; nh is hole density; ne is electron density
Therefore, electron density in doped germanium will be 2×1010m−3