Half Life Calculations Practice
Authored by Lisa Thompson
Science
10th Grade
NGSS covered
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15 questions
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1.
MATH RESPONSE QUESTION
1 min • 1 pt
An isotope of cesium 138 has a half-life of 30 years. If 1.00 g of cesium-138 disintegrates over a period of 90 years, how many grams of cesium-138 would remain?
Mathematical Equivalence
ON
Tags
NGSS.HS-PS1-8
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Level 2:After 4 half-life periods, 1.5 mg of a radioactive isotope remained. What was the mass of the original sample of the isotope?
You must use the chart to see if your answer is correct
6.0 mg
0.375 mg
3.0 mg
24 mg
Tags
NGSS.HS-PS1-8
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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?
100 grams
25 grams
2 grams
50 grams
Tags
NGSS.HS-PS1-8
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years.
How many grams are left after 2 half lives?
100 grams
25 grams
50 grams
14 grams
Tags
NGSS.HS-PS1-8
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The % of the parent isotope remaining after 1 Half Life.
50%
25%
12.5%
6.25%
Tags
NGSS.HS-PS1-8
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The diagram shows 32 atoms.
16 of the Red are parent isotopes
16 of the Green are daughter isotopes
How many half-lives have occurred?
0
1
2
3
Tags
NGSS.HS-PS1-8
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the Half life of this isotope?
5 seconds
10 seconds
15 seconds
20 seconds
Tags
NGSS.HS-PS1-8
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