A simple toy model of radioactive decay considers the constituents of the nucleus as being trapped inside a finite box potential and tries to calculate the probability that they can tunnel out. Uranium-238 decays to thorium-234 via the emission of alpha particles. Treating it as a one-dimensional problem, and given that the diameter of a uranium-238 nucleus is 12 fm, estimate the range of speeds that an alpha particle detected inside the nucleus could be found to have. Explain.