1. The problem statement, all variables and given/known data In a particular nuclear reaction, a neutron moving at 3.6×105ms−1 has a 70% chance of initiating a nuclear fusion reaction. Which of the following options is a possible probability of a neutron moving at 2.2×105ms−1 initiating the same nuclear reaction? I wouldn't be asking this if I really didn't know where to start. I don't even know which formula to use or how to begin solving this. Any help would be greatly appreciated, thanks!