alleryThe energy of the nth orbit in a hydrogen atom (Bohr's model) is:
A$E_n = +13.6/n^2$ eV (positive sign)
B$E_n = -13.6/n^2$ eV (negative, bound state)
C$E_n = -13.6 \times n^2$ eV (wrong dependence)
D$E_n = h/n$ (no constant)
Answer & Solution
Correct answer: B. $E_n = -13.6/n^2$ eV (negative, bound state)
**Bohr's energy formula for H:** E_n = -13.6/n² eV.
NEGATIVE because electron is bound.
n = 1 (ground state): -13.6 eV. n = ∞: 0 (ionised).
Quantised energy levels.
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