Answer to Question #123728 in Physics for shoaib

Question

Copper has a mass density of 8.95g/cm3 and in electrical resistivity of 1.55 × 10−8ohm-m at room temperature. Assuming the effective mass is “mo”. Calculate.
1) The concentration of the conduction electrons
2) Electrical conductivity

Answer 1

1)

$$n_e=z\frac{\rho_m N_A}{\mu}=1\frac{(8950)(6.02\cdot 10^{26})}{63.55}=8.48\cdot 10^{28}\frac{el}{m^3}$$

2)

$$\sigma=\frac{1}{\rho }=\frac{1}{1.55\cdot 10^{-8}}=6.45\cdot 10^{7}\frac{1}{\Omega m}$$