|q⟩
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Multiple choice
An operator
A
=
[
3
1
1
3
]
A = \begin{bmatrix}3 & 1 \\ 1 & 3\end{bmatrix}
A
=
[
3
1
1
3
]
acts on the normalized state
∣
ψ
⟩
=
[
1
/
5
,
2
/
5
]
|\psi\rangle = [1/\sqrt{5}, 2/\sqrt{5}]
∣
ψ
⟩
=
[
1/
5
,
2/
5
]
. What is the expectation value
⟨
ψ
∣
A
∣
ψ
⟩
\langle\psi|A|\psi\rangle
⟨
ψ
∣
A
∣
ψ
⟩
?
🔬 try it before you answer
5.0
3.0
4.0
19
/
5
=
3.8
19/5 = 3.8
19/5
=
3.8
Check answer