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WorksheetsDecay
Total questions: 15
Worksheet time: 15mins
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?
half-life
half-lives
half-lives
half-lives
What is the half-life of iodine-131?
32 days
8 days
16 days
24 days
What is Half-life?
The amount of time it takes for some of the nuclei in a sample of the isotope to decay
The amount of time it takes for half the electrons in a sample 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 to double the nuclei in a sample of the isotope to decay
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?
100.0g
50.0g
12.5g
8.5g
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?
0.25g
2.5g
25g
80g
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.
25mg
25g
10g
10mg
After the third half-life, how much of the sample is left?
1/2
1/3
1/16
1/8
Fermium-253 has a half-life of 0.334 seconds. A radioactive sample is considered to be completely decayed after 10 half-lives. How much time will elapse for this sample to be considered gone?
0.334 seconds
3.34 seconds
1.77 seconds
13.4 seconds
Earth elements decay and change into another element in a process called_____________.
radiation
isotope
radioactive decay
half-life
Geologist use the time it takes for a radioactive isotope to decay to half its original mass called a___________.
radioactive decay
isotope
half-life
carbon dating
When an unstable radioactive atom decays, it usually turns into:
a more stable atom
a less stable atom
the exact same atom but with less pure energy
empty space
What type of radioactive decay is this example?
Alpha
Negative Beta
Positive Beta
Gamma
What is the process called when an unstable atomic nucleus loses energy by emitting radiation?
Nuclear fusion
Radioactive decay
Nuclear fission
Ionization
If a radioactive substance has a half-life of 5 years, how much of a 100g sample will remain after 15 years?
12.5g
25g
50g
6.25g
Which of the following particles is typically emitted during radioactive decay?
Proton
Neutron
Electron
Alpha particle
