
Nuclear Half Lives

Quiz
•
Science
•
9th Grade
•
Easy
Standards-aligned
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 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
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A radioactive substance has a half-life of 10 years. If you start with 100 grams of the substance, how much will remain after 30 years?
25 grams
12.5 grams
50 grams
75 grams
Tags
NGSS.HS-PS1-8
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The half-life of a radioactive isotope is 5 days. If you start with 200 grams of the isotope, how much will remain after 15 days?
25 grams
100 grams
50 grams
75 grams
Tags
NGSS.HS-PS1-8
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A radioactive substance has a half-life of 2 hours. If you start with 500 grams of the substance, how much will remain after 6 hours?
125 grams
250 grams
375 grams
62.5 grams
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The half-life of a radioactive isotope is 1 year. If you start with 1000 grams of the isotope, how much will remain after 3 years?
125 grams
250 grams
500 grams
750 grams
Tags
NGSS.HS-PS1-8
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A radioactive substance has a half-life of 20 minutes. If you start with 800 grams of the substance, how much will remain after 1 hour?
600
400
100
200
Tags
NGSS.HS-PS1-8
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The half-life of a radioactive isotope is 7 days. If you start with 300 grams of the isotope, how much will remain after 21 days?
37.5 grams
75 grams
150 grams
225 grams
Tags
NGSS.HS-PS1-8
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