Half-Lives
Authored by Lisa Thompson
Science
9th Grade
NGSS covered
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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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
Tags
NGSS.HS-PS1-8
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following statements is true?
An unstable daughter isotope decays into a stable parent isotope.
An unstable parent isotope decays into a stable daughter isotope.
A stable daughter isotope decays into an unstable parent isotope.
A stable parent isotope decays into an unstable daughter isotope.
Tags
NGSS.HS-PS1-8
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
146C has a half life of 5730 years, how many years would it take the 4.0 g sample to decay to 0.25 g?
4 years
5730 years
22,920 years
28,650 years
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A 2.5 gram sample of an isotope of strontium-90 was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific Test Site. The half-life of strontium-90 is 28 years. In what year will only 0.625 grams of this strontium-90 remain?
1988
2016
2044
2072
Tags
NGSS.HS-PS1-8
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The half life of iodine-131 is 8 days. What fraction of an iodine-131 sample will remain after 40 days?
1/2
1/64
1/5
1/32
Tags
NGSS.HS-PS1-8
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the definition of half-life?
Time it takes for half of the atoms in a radioactive substance to decay.
Time it takes for half of the atoms in a radioactive substance to combine.
Time it takes for all of the atoms in a radioactive substance to decay.
Time it takes for half of the atoms in a non-radioactive substance to decay.
Tags
NGSS.HS-PS1-8
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