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75. Since the spreading is assumed uniform, the count rate
R
= 74,000/s is given by
R =
λ
N
=
λ
(
M
/
m
)(
a
/
A
),
where
M
= 400 g,
m
is the mass of the
90
Sr nucleus,
A
= 2000 km
2
, and
a
is the area in
question. We solve for
a
:
aA
m
M
R
AmRT
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This note was uploaded on 05/19/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Mass

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