59. the electrical resistivity of a metal at 300 k is 4.9x 10 (q-m). if the lorentz number is 2.45x 10- w-ohm/k?. the thermal conductivity of the metal will be

59. The electrical resistivity of a metal at 300 K is 4.9x 10 (Q-m). If the Lorentz number is 2.45x 10- W-ohm/K?. The thermal conductivity of the metal will be (A) 150 W/m/k (B) 600 W/m/k (C) 12 Wm/k (D) 25 W/m/k