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**Mon Oct 22, 2018 10:10 pm**In the hydrogen atomic spectrum, what is the wavelength of light associated with the n = 2 to n = 1 electron transition?

When I worked this problem out, I got -1.22 x 10^-7 as the answer but this isn't correct.

When I worked this problem out, I got -1.22 x 10^-7 as the answer but this isn't correct.