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- 1. Multiple ChoiceYou have 100 grams of radioactive C-14. The half life of C-14 is 5730 years.
How many grams are left after 1 half life?100 grams25 grams2 grams50 grams - 2. Multiple Choice
Imagine you have 50,000 atoms of uranium-238. If U-238 has a half-life of 4.5 billion years, how many U-238 atoms will be left after 4.5 billion years?
25,000
50,000
12,500
0
- 3. Multiple Choice
What is the Half Life of this isotope?
3 days
5 days
8 days
10 days
- 4. Multiple Choice
What is the Half life of this isotope?
5 seconds
10 seconds
15 seconds
20 seconds
- 5. Multiple Choice
The diagram shows 32 atoms.
16 of the Red are parent isotopes
16 of the Green are daughter isotopes
How many half-lives have occurred?
0
1
2
3
- 6. Multiple Choice
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
- 7. Multiple Choice
The % of the parent isotope remaining after 2 Half Lives.
50%
25%
12.5%
6.25%
- 8. Multiple Choice
The % of the parent isotope remaining after 1 Half Life.
50%
25%
12.5%
6.25%
- 9. Multiple ChoiceWhat is the half-life of iodine-131?32 days8 days16 days24 days
- 10. Multiple Choice
After 22,800 years, approximately what percentage of the original carbon-14 remains?
15%
12.5%
6.25%
3.125%
- 11. Multiple ChoiceIf the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?1 half-life2 half-lives3 half-lives4 half-lives
- 12. Multiple ChoiceAfter the third half-life, how much of the sample is left?1/21/31/161/8
- 13. Multiple Choice
A nuclear reaction occurs when the atom is
ready to give away electrons
stable
in need of electrons
unstable
- 14. Multiple Choice
The largest radioactive particle that can be stopped by your skin is called a(n)
positron
beta particle
alpha particle
gamma particle
- 15. Multiple Choice
The smallest and highest energy type of nuclear radiation is known as a(n)
alpha particle
beta particle
gamma particle
positron
- 16. Multiple Choice
A scientist detected radiation escaping from a material encased in a thin metal box. What type of radiation did the scientist most likely detect?
alpha particles
beta particles
gamma particles
positrons
- 17. Multiple Choice
All radioactive sources have a half-life.
Which statement about the half-life of a source is correct?
It is half the time it takes for an atom to decay
It is the length of time it takes for half of the original amount of the radioisotope to decay to another element.
It is half the time for the radioactive source to become safe
It is half the time it takes the activity of the source to decrease to zero
- 18. Multiple Choice
Can be stopped by aluminum foil; has no mass and negative charge.
beta particle
alpha partcle
gamma ray
half-life
- 19. Multiple Choice
Powerful radiation that can cause biological damage.
beta particle
alpha particle
gamma ray
carbon dating
- 20. Multiple Choice
The half-life of Pu-239 is 5 minutes. How much of a 200g sample is left after 20 minutes?
25g
180g
12.5
4g
- 21. Multiple Choice
What process is used to make energy in nuclear power plants?
fusion
oxidation
fission
combustion
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