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the density of an electron-hole pair in ...

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

A

`1×10^(10)`

B

`2×10^(10)`

C

`0.5×10^(10)`

D

`4×10^(10)`

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