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by Ciro Santilli (@cirosantilli, 37)

Hydrogen 1-2 spectral line (121.6 nm, 10.2e V)

 ... Quantum mechanics Quantum mechanics experiment Emission spectrum Spectral line Hydrogen emission spectrum Gross hydrogen emission spectrum
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Equation "Hydrogen spectral series mnemonic" gives for example from principal quantum number 1 to 2 a difference:
En​=−13.6eV[221​−121​]=10.2eV
(1)
which with Planck-Einstein relation gives about 121.6 nm (2.47×1015 Hz), which is a reasonable match with the value of 121.567... from the NIST Atomic Spectra Database.

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