What is the minimum energy needed to raise a hydrogen atom from its ground state to its first excited state (Eₙ = −13.6/n² eV)?
Correct answer A. 10.2 eV
Explanation
ΔE = E₂ − E₁ = −3.4 − (−13.6) = 10.2 eV. The value 12.1 eV is the gap from n = 1 to n = 3.
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