# The quantum mechanical treatment of the hydrogen atom gives the energy value: En = -13.6/n^2 eV atom^-1

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The quantum mechanical treatment of the hydrogen atom gives the energy value:

En = $\frac{-13.6}{n^2}$ eV atom-1

1. use this expression to find ∆E between n = 3 and n = 4

2. Calculate the wavelength corresponding to the above transition.

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(1) When n = 3

(2) Wave length = λ

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