Here we will look at an example of subatomic elastic collisions.High-speed neutrons are produced in a nuclear reactor duringnuclear fission processes. Before a neutron can trigger additionalfissions, it has to be slowed down by collisions with nuclei of amaterial called the moderator. In some reactors the moderatorconsists of carbon in the form of graphite. The masses of nucleiand subatomic particles are measured in units called atomic massunits, abbreviated u, where 1u=1.66×10−27kg. Suppose a neutron(mass 1.0 u) traveling at 2.6×107m/s makes an elastic head-oncollision with a carbon nucleus (mass 12 u) that is initially atrest. What are the velocities after the collision? If the neutron'skinetic energy is reduced to 3649 of its initial value in a singlecollision, what is the mass of the moderator nucleus? Express youranswer in atomic mass units as an integer.
