 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2025/ii/paper-4/33c/c/solution

Codex  0 Created 2026-09-24 Updated 2026-09-25

n = 2

{∣2, 0, 0 ⟩, ∣2, 1, - 1 ⟩, ∣2, 1, 0 ⟩, ∣2, 1, 1 ⟩} .

The first vector is the

2 s

state and the other three are the

2 p

states. All have the same unperturbed energy

E_{2}

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