(a) Does the electric field do work on the electrons of Figure \(31.30 b\) as they accelerate between collisions?

(b) On average, does the kinetic energy of the electrons increase as they drift through the lattice?

(c) What do your answers to parts \(a\) and \(b\) imply about the energy in the lattice?

Figure 31.30 The effect of an applied elec- tric field on the motion of a free electron through a lattice of ions. (a) Motion in absence of an electric field ion start end Electron's displacement is very small over long time interval.