Unformatted text preview: 56. Let UB (t) = 1 Li2 (t). We require the energy at time t to be half of its ﬁnal value: U (t) =
2
√
∞) = 1 Li2 . This gives i(t) = if / 2. But i(t) = if (1 − e−t/τL ), so
f
4
1
1 − e−t/τL = √
2 1
=⇒ t = −τL ln 1 − √
2 = 1.23τL . 1
2 UB (t → ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics, Energy

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