A sample of high-purity copper has a residual resistance of 10-10 Ohm•m, but with the introduction of 0.1 atomic % Cd2+ ions, it increases to 5 • 10-10 Ohm•m. Estimate what the resistivity of copper will be if you introduce 0.1 at. % In3+ or Sn4+. Note. At low temperatures, the metal resistance caused by impurity ions is proportional to (DZ)2, where DZ is the difference in the valence of impurity ions and metal ions.

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