The density of an electron-hole pair in a pure germanium is `3xx 10^(16) m^(-3)` at room temperature. On doping with aluminium, the hole density increases to `4.5 xx 10^(22) m^(-3)`. Now the electron density ( in `m^(-3))` in doped germanium will be

Options

A. `1xx10^(10)`
B. `2xx10^(10)`
C. `0.5 xx 10^(10)`
D. `4xx10^(10)`

Answer

B