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  1. The n-th energy level is Eₙ = 13.6/n² (in units of electron-volts), eV) So the 4-th level has energy E₄ =  -13.6/4² = 0.85 eV ‘suitable units’ could also mean joules, in which case: E₄  = 0.85...

    1 Answers · Science & Mathematics · 07/02/2020

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