A single impmity particle of mass 32 enters a solid with initial energy of 1 keV. The mass of the lattice atoms is 56 and the displacement energy is 25 eV. Estimate the following numbers: (a) How many PKAs does the incident particle create before it comes to rest in the solid? Follow the impurity particle collisions with lattice atoms in detail, starting from its entry into the lattice. Assume that each lattice atom struck by the impurity atom receives the average nergy transfer of the collision (average energy - IIZAE). (b) How many lattice atom displacements are caused by the incident particle