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E5 - E2 = -Eo/5² + Eo/2² = 0,21·Eo = 2,856eV = 4,57 · 10^-19 J
E = h·f
f = E/h = 4,57 · 10^-19 / 6,63 · 10^-34 = 6,9 · 10^14 Hz