Question

Calculate the shortest wavelength of visible light (in nanometers) seen in the spectrum of the hydrogen atom.
nm
What are the principle quantum numbers for the levels in this transition?

Answer 1

It depends somewhat on what you call the visible spectrum. I think most texts use 400 nm to about 700 nm but I have seen some references that list 390 nm to 750 nm as detectable by the human eye. Here is a site that lists the wavelengths of the Balmer Series. Take your pick (and it shows the principle quantum numbers involved).
http://hyperphysics.phy-astr.gsu.edu/hbase/tables/hydspec.html