1.

An intrinsic semiconductor has 10^(8)m^(-3) free electrons and is doped with pentavalent impurity atoms of density 10^(24)m^(-3) . The free electron density will increase by

Answer»

`10^8m^(-3)`
`10^(16)m^(-3)`
`10^(20)m^(-3)`
`10^(24)m^(-3)`

Solution :Pentavalent impurity ATOM CONTRIBUTES 1 electron to the intrinsic semiconductor , hence `10^(24)` impurity atom per unit volume will contribute `10^(24)` electrons to the intrinsic semiconductor .
The electron density will increase by `10^(24) m^(-3)`.


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