Physics

Problem

Copper has conductivity

5.8\times10^{7}\,\text{S}\,\text{m}^{-1}

and free-electron number density

8.5\times10^{28}\,\text{m}^{-3}

. Take

e=1.6\times10^{-19}\,\text{C}

. The electron mobility in copper is closest to a)

4.3\times10^{-2}\,\text{m}^2\,\text{V}^{-1}\,\text{s}^{-1}

2.1\times10^{-3}\,\text{m}^2\,\text{V}^{-1}\,\text{s}^{-1}

4.3\times10^{-3}\,\text{m}^2\,\text{V}^{-1}\,\text{s}^{-1}

4.3\times10^{-6}\,\text{m}^2\,\text{V}^{-1}\,\text{s}^{-1}