3. (a) Small cylindrical particles have been observed to nucleate in certain alloy systems. i. What values of r and l will minimize the energy barrier to the formation of these particles? (3 Marks) ii. What surface energies favor the formation of long, thin cylinders? Explain. (2 Marks) - 1 is the surface energy of the circular face. - 2 is the surface energy along the length of the cylinder