1.

An n - type semiconductor has resistivity 0.1Omegam . The number of donor atoms which must be added to achieve this is ( mu=0.05 m^2V^(-1)s^(-1) ) :

Answer»

`1.25xx10^(17)`
`1.25xx10^(23)`
`1.25xx10^(21)`
`1.25xx10^(22)`.

ANSWER :C


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