Posted by Tina on Monday, March 21, 2011 at 12:08am.
1/wavelength = R(1/n1^2 - 1/n2^2)
R = Rydberg constant. I assume you have that in your text or notes.
For n1 you substitute 2 and square it.
For n2 substitute 7 and square it.
From wavelength, you can calculate energy from E = hc/wavelength.
(Note:I arranged n1 and n2 so you would get a positive number for wavelength. You must remember that you are going from 2 to 7 which means energy is absorbed.)
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