When an electron in a hydrogen atom drops from the second to the first excited energy state it emits a bright red emission line called hydrogen alpha.

Question

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When an electron in a hydrogen atom transitions from the second excited state (n=3) to the first excited state (n=2), it emits electromagnetic radiation in the form of a bright red emission line known as the Hydrogen-alpha (Hα) line, which is a specific wavelength of light (656.28 nm) in the red part of the visible spectrum.

When an Electron in a Hydrogen Atom Drops from the Second