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1.) The spectral lines observed for hydrogen arise from transitions from excited states back to the n=2 principle quantum level. Calculate the wavelengths associated with the spectral transitions of the hydrogen atom from the n=6,5,4 and 3 to the n=2 level.
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you have to use the Rydbergs equation \[E= -2.178 \times 10^{-18} J(\frac{ 1 }{ n _{f}^{2} }-\frac{ 1 }{ n_{i}^{2} })\] where nf in your case is = 2 and ni = 6,5,4,3 http://www.kentchemistry.com/links/AtomicStructure/waveenergy.htm
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