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WorksheetsHALF LIFE
Total questions: 15
Worksheet time: 24mins
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.
What is the Half life of this isotope?
a)
5 seconds
b)
10 seconds
c)
15 seconds
d)
20 seconds
10.
What type of decay is being illustrated in following picture?
a)
beta decay
b)
alpha decay
11.
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
12.
What is Half-life?
a)
The amount of time it takes for some of the nuclei in a sample of the isotope to decay
b)
The amount of time it takes for half the electrons in a sample of the isotope to decay
c)
The amount of time it takes for half the nuclei in a sample of the isotope to decay
d)
the amount of time it takes to double the nuclei in a sample of the isotope to decay
13.
Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?
a)
0.25g
b)
2.5g
c)
25g
d)
80g
14.
After 4 half-lives, 1g of a sample of Krypton-85 remains unchanged. What was the original mass of the sample?
a)
16g
b)
32g
c)
0.0625g
d)
4g
15.
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
a)
100.0g
b)
25.0g
c)
12.5g
d)
8.5g
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