1. The problem statement A hydrogen atom has an electron in the fundamental state. a. Show that a radiation with λ = 50 nm will ionize the atom. b. What will be the excess kinetic energy of the electron in joules? What is this question asking? Is it asking what wavelength will free an electron? Because if so, it didn't give me the work function for hydrogen. I think I know how to calculate that, but I'm not certain. Or is it asking something else entirely? 2. Relevant equations Work function/Planck's constant= threshold frequency wavelength*threshold frequency=frequency Energy=Planck's constant*frequency 3. The attempt at a solution I'm stumped. If I understood what to look for, I'd be able to attempt a solution.