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# chem practice?

An electron transitioning from a higher energy level down to the first energy level in a hydrogen atom emits light with a wavelength of 103 nm. Determine the energy level the electron started from before moving down to the first energy level.

Can someone explain how id do this ?

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- NCSLv 74 months agoFavorite Answer
You can find the energy of the emitted photon with

E = hc / λ

I get E = 1.93-18 J = 12.1 eV

Then by Rydberg

E = 13.6eV * (1/1² - 1/n²)

Set them equal and solve for n.

I get n = 3

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