What is the energy of the n = 3 level of a hydrogen atom (Eₙ = −13.6/n² eV)?
Correct answer B. −1.51 eV
Explanation
E₃ = −13.6/3² = −13.6/9 = −1.51 eV. Dividing by 3 instead of 9 gives the wrong value −4.53 eV.
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