STANDARD Physics Bohr's Model MCQ Question
If E is the energy of nᵗʰ orbit of hydrogen atom the energy of nᵗʰ orbit of He atom will be
E
2E
3E
4E
Correct Answer
Detailed Explanation
Since Bohr's formula for energy in nᵗʰ orbit is Eₙ = -me⁴Z²/8ε₀²h²n², Eₙ ∝ Z². For hydrogen (₁H²), Zₕ = 1 and Eₕ = E. For helium (₂He⁴), Zₕₑ = 2. Therefore, Eₙ = (Zₕₑ/Zₕ)²Eₕ = (2)²E = 4E.
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