1. The problem statement, all variables and given/known data Consider a nebula of pure hydrogen which is completely ionized and in steady-state (# ionizations/sec = # recombinations/sec) at a constant temperature and density. Suppose the source of the ionizing radiation suddenly “turns off”. Find and graph the electron density as a function of time, Log ne versus Log t, using: Note – do not include captures into the ground state, as that will emit photons that will ionize another atom someplace else - B is what you need to use. Also the “recombination time” is just a first-order, which depends on ne. For finding ne versus time you cannot use a constant recombination rate. 2. Relevant equations I tried to figure out but I really don't know! 3. The attempt at a solution I am sorry I don't know!