Given that the electron effective mass m$*$ for the GaAs is $0\mathrm{.}067$m$,$ calculate the thermal velocity of the electrons in the conduction band $($CB$).$ The electron drift mobility depends on the mean free time between electron scattering events $($between electrons and lattice vibrations$).$Given $=$ e$/$m$*,$ and $=8500$ cm$^2$V$$s$$ for GaAs, calculate $,$ and hence the mean free path of CB electrons. How many unit cells is if the lattice constant a of GaAs is $0\mathrm{.}565$ nm$?$ Calculate the drift velocity v$\_$d $=$ E of the CB electrons in an applied field E of $10$ V m$.$ What is your conclusion?