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Multiple choice
A superposition of two energy levels with gap
ω
10
=
2
\omega_{10} = 2
ω
10
=
2
(
ℏ
=
1
\hbar = 1
ℏ
=
1
) beats with survival probability
cos
2
(
ω
10
⋅
t
/
2
)
\cos^2(\omega_{10} \cdot t / 2)
cos
2
(
ω
10
⋅
t
/2
)
. At
t
=
π
/
4
t = \pi/4
t
=
π
/4
, what is this probability?
1/2 = 0.5
2
/
2
\sqrt{2}/2
2
/2
≈ 0.707
1/4 = 0.25
1
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