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WorksheetsHalf life
Total questions: 13
Worksheet time: 41mins
What is Half-life?
The amount of time it takes for half the nuclei in a sample of the isotope to become radioactive
The amount of time it takes for half the nucleus of the isotope to decay
The amount of time it takes for half the nuclei in a sample of the isotope to decay
the amount of time it takes for half the number of protons in the nucleus to decay
Why do some elements have half-lives?
they radioactively decay
half of their atom gets stolen
They are Twizzlers that break in half
After 22,800 years, approximately what percentage of the original carbon-14 remains?
15%
12.5%
6.25%
3.125%
The % of the parent isotope remaining after 1 Half Life.
50%
25%
12.5%
6.25%
The diagram shows 32 atoms
32 of the Red are the parent isotope
0 of the atoms are daughter isotopes
How many half-lives have occurred?
0
1
2
3
From the nuclear belt of stability, you can see that
As atoms increase in atomic number, more neutrons are needed to achieve a stable isotope
As atoms increase in atomic number, fewer neutrons are needed to achieve a stable isotope
As atoms decrease in atomic number, more neutrons are needed to achieve a stable isotope
There is no relationship between the atomic number and the number of neutrons
A PET-scan patient is injected with radioactive oxygen-
5, whose half-life is 2 minutes. Approximately what
fraction of the original remains undecayed an hour
later?
About 1/2
About 1/30
About ) (21)30
About (301)21
