1. The problem statement, all variables and given/known data Estimate the highest possible frequency (in Hertz), and the smallest possible wavelength, of a sound wave in aluminium, due to the discrete atomic structure of this material. We're given the mass of aluminum, Young's Modulus, and mass density. 2. Relevant equations w=k* √(Y/ρ) 3. The attempt at a solution Basically, I know that the largest wave has to fit inside the interatomic distance, but I don't know how to find this distance.