60.
(a) The rate of heat production is
dE
dt
=
3
X
i
=1
R
i
Q
i
=
3
X
i
=1
λ
1
N
i
Q
i
=
3
X
i
=1
Ã
ln 2
T
1
/
2
i
!
(1
.
00 kg)
f
i
m
i
Q
i
=
(1
.
00 kg)(ln 2)(1
.
60
×
10
−
13
J
/
MeV)
(3
.
15
×
10
7
s
/
y)(1
.
661
×
10
−
27
kg
/
u)
·
(4
×
10
−
6
)(51
.
7MeV)
(238 u)(4
.
47
×
10
9
y)
+
(13
×
10
−
6
)(42
.
7MeV)
(232 u)(1
.
41
×
10
10
y)
+
(4
×
10
−
6
)(1
.
31 MeV)
(40 u)(1
.
28
×
10
9
y)
¸
=1
.
0
×
10
−
9
W
.
(b) The contribution to heating, due to radioactivity, is
P
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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, Heat

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