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True / False
Consider multiplying an entire wavefunction by a constant global phase factor
e
i
θ
e^{i\theta}
e
i
θ
with
θ
\theta
θ
real, giving
ψ
′
=
e
i
θ
ψ
\psi' = e^{i\theta}\psi
ψ
′
=
e
i
θ
ψ
. True or false: this global phase change leaves every measurable probability unchanged, so
ψ
\psi
ψ
and
ψ
′
\psi'
ψ
′
represent the same physical state.
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True
False
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