Two emission 223
or t
Write down the
nucleon number and the proton
number of remaining nucude after the
127
2203
3 B
>
co
nucleon Aumber 223
(ii) proton number
LOL
A
2009
sample has a half ufe of 4 years on a
plot
the decay curve
graph paper
after a period of
(2
a graph to Show
32 yrs
mars (9)
200
200
100
so
25
12.5
6.25 3.125
1.5623
o
time yrs)
20
A 4
8.
16
24
28
32
(2)
( what
for the sample
period of time would et
would it tare
7
to reduce
to
?​