(a) Using the data in Figure 18.8, determine the values of r0 and a from Equation 18.10 fo...

(a) Using the data in Figure 18.8, determine the values of r0 and a from Equation 18.10 for pure copper. Take the temperature T to be in degrees Celsius.

(b) Determine the value of A in Equation 18.11 for nickel as an impurity in copper, using the data in Figure 18.8.

(c) Using the results of parts (a) and (b), estimate the electrical resistivity of copper containing 2.50 at% Ni at 120°C.

Figure 18.8 The electrical resistivity versus temperature for copper and three copper–nickel alloys, one of which has been deformed. Thermal, impurity, and deformation contributions to the resistivity are indicated at — 100°C.

[Adapted from J. O. Linde, Ann. Physik, 5, 219 (1932); and C. A. Wert and R. M. Thomson, Physics of Solids, 2nd edition, McGraw-Hill Book Company, New York, 1970.]

 (18.10)

 (18.11)