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WorksheetsHalf-Life
Total questions: 15
Worksheet time: 30mins
Name
Class
Date
1.
After the third half-life, how much of the sample is left?
a)
1/2
b)
1/3
c)
1/16
d)
1/8
2.
If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.
a)
1.25mg
b)
1.25g
c)
10g
d)
10mg
3.
The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?
a)
3.0g
b)
0.25mg
c)
0.3g
d)
0.25g
4.
If 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?
a)
1 half-life
b)
2 half-lives
c)
3 half-lives
d)
4 half-lives
5.
After 22,800 years, approximately what percentage of the original carbon-14 remains?
a)
15%
b)
12.5%
c)
6.25%
d)
3.125%
6.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
7.
The % of the parent isotope remaining after 1 Half Life.
a)
50%
b)
25%
c)
12.5%
d)
6.25%
8.
The % of the parent isotope remaining after 2 Half Lives.
a)
50%
b)
25%
c)
12.5%
d)
6.25%
9.
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?
a)
0
b)
1
c)
2
d)
3
10.
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?
a)
0
b)
1
c)
2
d)
3
11.
What is the Half life of this isotope?
a)
5 seconds
b)
10 seconds
c)
15 seconds
d)
20 seconds
12.
What is the Half Life of this isotope?
a)
3 days
b)
5 days
c)
8 days
d)
10 days
13.
What type of decay is being illustrated in following picture?
a)
beta decay
b)
alpha decay
14.
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?
a)
25,000
b)
50,000
c)
12,500
d)
0
15.
You 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?
How many grams are left after 1 half life?
a)
100 grams
b)
25 grams
c)
2 grams
d)
50 grams
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