1.

A Ge specimen is doped with Al. The concentration of acceptor atoms is ~10^(21) atoms/ m^3 . Given that the intrinsic concentration of electron hole Paris is ~10^(19)//m^3 , the concentration of electrons in the specimen is :

Answer»

`10^(17)//m^3`
`10^(15)//m^3`
`10^(4)//m^3`
`10^2//m^3`

Solution :`n_i^2=n_exxn_n`
`:. n_e =(n_i^2)/(n_h)=(10^(19))^2/10^(21)=10^(17)//m^3`


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