Posted by adly on Monday, November 7, 2011 at 11:12pm.
E = h*frequency
Solve for E.
E = 2.180E-18*(1/4 - 1/x^2)
Solve for x which is the end orbit for the electron. The 1/4 comes from 1/n^2 - 1/2^2 = 1/4.
I looked at it quickly; I think x = 3.
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