A hydrogen-like ion has a nucleus of charge +Ze and a single electron outside this nucleus. The

Question:

A hydrogen-like ion has a nucleus of charge +Ze and a single electron outside this nucleus. The energy levels of these ions are Z2RH/n2 (where Z = atomic number). Calculate the wavelength of the transition from n × 3 to n × 2 for He+, a hydrogen-like ion. In what region of the spectrum does this emission occur?