47. We note that 3.82 days is 330048 s, and that a becquerel is a disintegration per second
(see §423). From Eq. 3419, we have
NR
T
VV
==
×
F
H
G
I
K
J
=×
12
5
3
10
3
2
155 10
330048
2
74 10
ln
.
ln
.
Bq
m
sa
t
o
m
s
m
where we have divided by volume
v
. We estimate
v
(the volume breathed in 48 h =
2880 min) as follows:
2
1
1000
2880
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 Spring '08
 Any
 Physics

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