Problem 2 Corroboration of the Wiedemann-Franz-Lorenz law. Given the following experimental data at 20°C for pure metals, compute the corresponding values of the Lorenz number, L, defined in Eq. 9.9-1. Metal (1/k) (ohm. cm) k (cal/cm s.K) Na 4.6 × 10-6 0.317 Ni 6.9 × 10-6 0.140 Cu 1.69 x 10 6 0.92 Al 2.62 x 10-6 0.50