**Problem 3**The alloy 80 wt.% Au–20 wt.% Cu is sometimes used in low-voltage dc electrical contacts because pure gold is mechanically soft and the addition of copper increases the hardness of the metal without sacrificing the corrosion resistance. Predict the resistivity of the alloy and compare it with the experimental value of 130 nΩ m. Assume that the coefficient \( A = 450 \, \text{nΩ m} \) and \( \rho_{Au} = 22.3 \, \text{nΩ m} \).

Given information: The the weight percentage of metal in the alloy: Au: 80 wt% Cu: 20 wt% The…

Answered: The alloy 80 wt.% Au-20 wt.% Cu is…

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