By READING the R vs t graph shown below, determine R. & the R(x10¹² decays/s) 12 mean life.
By READING the R vs t graph shown below, determine R. & the R(x10¹² decays/s) 12 mean life.
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Transcribed Image Text:Part 1: Decay Rate graph
By READING the R vs t graph shown below, determine R. & the mean life.
R (x10¹² decays/s)
12
9.
6.
3.
1
Part 2: Half-life (straightforward determination)
2
60.
40.
3
20.
1
4
A pure sample of a newly discovered radioactive element is discovered. After 8 s, only half of the element remains. What's the half-life of
the element?
8s
A pure sample of a second newly discovered radioactive element is discovered. After 323 s, only a quarter of the element remains. What's
the half-life of the element?
161.5 s ✓
2
t(s)
5
A pure sample of a third newly discovered radioactive element is discovered. After 453 s, only 1/8 of the element remains. What's the half-
life of the element?
151 s
Part 3: Half-life graph
By READING the N vs t graph shown below, determine N. & the half-life.
N (x10¹8 atoms)
80
A pure sample of a fourth newly discovered radioactive element is discovered. After 2736 s, only 1/256 of the element remains. What's the
half-life of the element?
342 s
3 4
Ro 11.4e12
5 6
mean life = 12 s
7 8 9 10
t(h)
decays/s
x
No=64e18
half-life = 12 s
atoms
X
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