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Suppose a pure Si-crystal has 5xx10^(28)...

Suppose a pure Si-crystal has `5xx10^(28) "atoms" m^(-3)`. It is doped by 1 ppm concentration of pentavalent As. Calculate the number of electrons and holes. Give that `n_(i)=1.5xx10^(16)m^(-3)`.

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`n_e=5xx10^22 per m^3`
`n_h=4.5xx10^9 per m^3`
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