Resource: http://phet.colorado.edu

9. What happens when you have one hundred U-238 atoms (no U-235) and shoot one neutron? 10. We want to know how the percentage of U-235 atoms affects the percentage of U-235 nuclei fissioned. Describe what happens in each of the following situations when you shoot ONE neutron into the field of nuclei on the screen. *Note: When you shoot your neutron, make sure it hits a U-235 atom. Atoms % U-235 (#U-235 + Total) % of Nuclei Fissioned (see bottom right corner) 100 U-235 0 U-238 80 U-235 20 U-238 60 U-235 40 U-238 40 U-235 60 U-238 20 U-235 80 U-238 0 U-235 100 U-238