 Solution

ID: past-exam-of-the-short-options-paper-shared-by-prelims-and-parts-a-and-b-of-the-physics-course-of-the-university-of-oxford/2016/s3/2/e/solution

e^{- i E_{0} t /ℏ} [ϕ_{0} + e^{- iω t} ϕ_{1}] / 2

. It becomes the opposite relative-sign superposition when

e^{- iω t} = - 1

, first at

t_{m i n} = π / ω

. The overlap with the initial state is proportional to

1 + e^{- iω t}

and vanishes then; global phase is immaterial.

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