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As per your syllabus, what is the energy of the first orbit of He⁺ (Z = 2, n = 1)?
A−2.18 × 10⁻¹⁸ J
B−8.72 × 10⁻¹⁸ J
C−4.36 × 10⁻¹⁸ J
D−1.09 × 10⁻¹⁸ J
Answer & Solution
Correct answer: B. −8.72 × 10⁻¹⁸ J
As per your syllabus, eqn 2.14 and Problem 2.11, E = −(2.18 × 10⁻¹⁸) × Z²/n² = −2.18 × 10⁻¹⁸ × 4/1 = −8.72 × 10⁻¹⁸ J.
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