WorksheetsHalf-Life
Total questions: 11
Worksheet time: 55mins
Name
Class
Date
1.
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
2.
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
3.
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
4.
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
5.
When nuclei decay, massive amounts of __________ is released.
a)
energy
b)
jello
c)
protons
d)
neutrons
6.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
7.
What is the Half life of this isotope?
a)
5 seconds
b)
10 seconds
c)
15 seconds
d)
20 seconds
8.
What is the Half Life of this isotope?
a)
3 days
b)
5 days
c)
8 days
d)
10 days
9.
Radioactive carbon-14 is often useful in determining the absolute age of geologic samples because radioactive isotopes
a)
decay at a regular rate
b)
become less stable during decay
c)
remain unchanged over time
d)
stabilize after four half-lives
10.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
11.
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
100 %
