The Bloch-Gruneisen formula says that at low temperatures, this quantity depends on a power of temperature and that at a large range of temperatures, it increases linearly with temperature.
In ballistic transport, the contribution to this quantity from scattering is negligible because the material is smaller than the mean free path. The Bloch-Gruneisen formula says that at low temperatures, this quantity depends on a power of temperature and that at a large range of temperatures, it increases linearly with temperature. Doping a semiconductor (*) reduces this quantity, which can be added to the imaginary reactivity to get impeditivity, the complex extension of this quantity. It is proportional to area and inversely proportional to length. It is defined as the ratio of electric field and current density and has units of ohm-meters. The inverse of conductivity is, for 10 points, what quantity that measures a material's opposition to electric current?
In ballistic transport, the contribution to this quantity from scattering is negligible because the material is smaller than the mean free path.
resistivity [accept resistance because we're nice even though none of the clues talk about that]