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The second-order energy correction from a single coupled level is
E
(
2
)
=
∣
V
∣
2
/
(
E
0
−
E
1
)
E^{(2)} = |V|^2/(E_0 - E_1)
E
(
2
)
=
∣
V
∣
2
/
(
E
0
−
E
1
)
, with
V
=
⟨
1
∣
H
′
∣
0
⟩
=
0.6
V = \langle 1|H'|0\rangle = 0.6
V
=
⟨
1∣
H
′
∣0
⟩
=
0.6
,
E
0
=
1
E_0 = 1
E
0
=
1
, and
E
1
=
4
E_1 = 4
E
1
=
4
. What is
E
(
2
)
E^{(2)}
E
(
2
)
?
-0.2
0.12
-0.12
-0.36
Check answer