In class you we derived the "diffusion half-distance" as x=Dt. Here we define the "diffusion distance" as the position where the ratio of the local concentration to the concentration at x=0, equals 1/ e. Mathematically, the "diffusion distance" is defined as x=4Dt (a) Given the following values for Al self-diffusion, estimate the diffusion distance for self-diffusion of Al at 125C in one day: D=0.047cm2/s; activation energy for diffusion =1.28eV. Give your answer for the diffusion distance in both m and nm. (b) How