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If resistivity of pure silicon is 3000 O...

If resistivity of pure silicon is `3000 Omega m` and the electron and hole mobilities are  `0.12m^(2)v^(-1)s^(-1)`and `0.045 m^(2)v^(-1)s^(-1)` respectively, determine. The resistivity of a specimen of the material when `10^(19)` atoms of phosphorous are added `per m^(3)` Given  `e=1.6 xx10^(-19) c, rho =3000Omega, u_(e)=0.12m^(2)v^(-1)s^(-1), u_(h)=0.045m^(2)v^(-1)s^(-1)`

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