Question: The Lyman - alpha ( Ly - ) series is a set of spectral lines of hydrogen when the electron falls to the state .

The Lyman-alpha (Ly-) series is a set of spectral lines of hydrogen when the electron falls to the state. If its wavelength is . What was the original principal quantum number of the electron in hydrogen before it relaxed to a lower state? (Hint: Round your answer to the nearest integer.)

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