A hydrogen-like ion has a nucleus of charge +Ze and a single electron

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A hydrogen-like ion has a nucleus of charge +Ze and a single electron outside this nucleus. The energy levels of these ions are -Z2 RH/n2 (where Z is the atomic number). Calculate the wavelength of the transition (nm) from n = 3 to n = 2 for He+, a hydrogen- like ion. What would be the perceived colour of this emission?

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