P31_056.PDF
(
70 KB
)
Pobierz
Chapter 31 - 31.56
56.Let
U
B
(
t
)=
2
Li
2
(
t
). We require
th
e energy at time
t
to be half of its final value:
U
(
t
)=
2
U
B
(
t
)=
4
Li
f
.Thisgives
i
(
t
)=
i
f
/
√
2. But
i
(
t
)=
i
f
(1
→
∞
−
e
−
t/τ
L
), so
1
−
e
−
t/τ
L
=
1
√
2
⇒
t
=
−
τ
L
ln
1
−
1
√
2
=1
.
23
τ
L
.
=
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