1. The problem statement, all variables and given/known data Estimate the resistivity of an amorphous metal whose mean free path is of the order of an atomic spacing. Compare your answer to crystalline copper. 2. Relevant equations VF = h(bar) KF / m VF = l / τ ρ = m / n e2 τ 3. The attempt at a solution I think my real issue with this question is i'm not sure what are reasonable numbers to estimate with. We need to find τ to plug into ρ = m / n e2 τ Using VF = l / τ we can rearrange to get τ = l / VF for l: We are told the mean free path, l, is of the order of an atomic spacing but I am not sure what is a reasonable estimation of this is? for VF: VF = h(bar) KF / m KF3 = 3π2n where n = NAρ/atomic weight Again Im not sure what to use as my values for ρ and atomic weight. It seems as though I am missing something about amorphous metals. I understand that they have disordered structures but how can i make an estimation for KF with that little information. Thanks in advance to anyone that replies and apologies if this is a bit of a basic question.