Advertisement
*iffi,
11fiprrffiiffi
*iri+ffi,ffir#ffi
.$-*rtr1j,
+4$'ffi:##ffi
i
i'F*.ffir
ffi$,,
+1i*i'#,#ffi
#
t tNPUTI
(four
times)
llEf,ff-HxT
=
LH ( H+HB
)
nECffY-KxT
=
LH{H+HB}
EEf,HY:-HxT
=
LH(H+HE)
NECHY
:
-KxT =
LH { H+HB }
t]ECHY
:
-HXT=LH
( H+HB
)
Enters
the edited
equation.
of
variables
for the radioactive
de-
and
38.
Solving an Equation
Press
ffi
to displuy the
menu
cay equation entered
on
pages
37
1.2
IBE
4
i1$#$j#-ffiffi
H=
,
BBB
1
1
0.9
.F*,,,1,ffi,iF'1ffiffii+H
H=
t
E,
36BE
15.3
iffi*'fu-ffi
HB=1F,
=FBB
['.#-ff-*Tuffi
T=8, ges
,
P5EI
E.
EBEE
IilIIEICil
Example: Garbon-|4 Dating,
Wood
on the outer
surface
of
a giant
sequoia tree
exchanges
carbon
with
its environment. The radioactivity
of
this wood is 15.3 counts per minute per gram
of
carbon.
A
sample
of wood from the
center
of the
tree
yields 10.9 counts per minute per
gram
of
carbon.
The rate constant
for
the radioactive form of
carbon,
rAC,
is 1.20
x
10-4. How old is the
tree?
What
is the half-life
of
t4C?
Keys:
Display:
Description:
Stores
rate
constant.
Stores
activity at time
T.
Stores
initial
activity.
Calculates age
of
the
tree
in
years.
40
1: Getting Started
Advertisement
