alleryAccording to Bohr's model, the radius of the n-th orbit in a hydrogen atom is proportional to:
An
Bn²
C1 / n
D1 / n²
Answer & Solution
Correct answer: B. n²
1. Bohr quantised angular momentum: m v r = n h / (2π).
2. Combined with the Coulomb-centripetal balance gives r_n = n² a₀ for hydrogen, where a₀ ≈ 52.9 pm.
3. So radius scales as n².
_Source: syllabus Chem Ch 2 §2.4 Bohr's Model_
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