the lowest energy transition that can occur is to the next lower level from 7p1. For Hydrogen like atoms, the energy livel depends on n alone. So n goes from 7 to 6, the formula is here:
https://en.wikipedia.org/wiki/Energy_level#Orbital_state_energy_level:_atom.2Fion_with_nucleus_.2B_one_electron
What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
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