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The number densities of electrons and ho...

The number densities of electrons and holes in pure silicon are `1.5 xx 10^16m^-3`. On doping with indium, the hole density becomes `4.5 xx 10^22 m^-3`, the electron density is

A

`0.5 xx 10^9 m^-3`

B

`5 xx 10^9 m^-3`

C

`50 xx 10^9 m^-3`

D

`500 xx 10^9 m^-3`.

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