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80. (a) Assuming a “target” area of one square meter, we establish a ratio:
rate through you
total rate upward
=
1m
2
(2
.
6
×
10
5
km
2
)(1000 m
/
km)
2
=3
.
8
×
10
−
12
.
The SI unit becquerel is equivalent to a disintegration per second. With half the betadecay electrons
moving upward, we Fnd
rate through you =
1
2
(
1
×
10
16
/
s
)(
3
.
8
×
10
−
12
)
=1
.
9
×
10
4
/
s
which implies (converting s
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Unformatted text preview: → h) the rate of electrons you would intercept is R = 7 × 10 7 / h. (b) Let D indicate the current year (2000, 2001, etc) Combining Eq. 4315 and Eq. 4317, we Fnd R = R e − t ln 2 /T 1 / 2 = ( 7 × 10 7 / h ) e − ( D − 1996) ln 2 / (30 . 2 y) ....
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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

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