Sodium is monovalent

PHYSICS · Subjective · Fermi University Physics · Condensed Matter, Materials & Soft Matter · Free electrons, energy bands and electronic structure · Free electrons, energy bands and electronic structure

Condensed Matter Physics, Ch The free-electron gas: what Drude gets right and what only Fermi fixes

Problem

Sodium is monovalent, and its conduction electron density is n=2.65×1028 m−3n=2.65\times10^{28}\,\mathrm{m^{-3}}. At 295 K295\,\mathrm{K} its resistivity is ρe=4.75×10−8 Ω m\rho_e=4.75\times10^{-8}\,\Omega\,\mathrm{m}. Find the relaxation time τ\tau for sodium's conduction electrons, in femtoseconds.

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