
CW: March 5th: Radiometric Questions
Authored by Alicia LaCross
Science
9th - 11th Grade
Used 5+ times

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8 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
You find a rock sample with radioactive atoms present. If 12.5% of the original radioactive atoms were present, how many half-lives has the rock been around for? (Hint, at Half-Life = 0, you start with 100%)
zero
1
2
3
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
You find a rock sample with radioactive atoms present. If 25% of the original radioactive atoms were present, how many half-lives has the rock been around for? (Hint, at Half-Life = 0, you start with 100%)
zero
1
2
3
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
If the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there have been two half-lives?
25 years
200 years
400 years
800 years
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Suppose you found a material in which 12.5% of the original radioactive atoms were still present. If the half-life of an atom is 60 years, how old is the material?
30 years old
60 years old
120 years old
180 years old
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Using ESRT (A) [Radioactive Decay Data], what is the half-life in standard notation of carbon-14?
5,700 years
57,000 years
570,000 years
5,700,000 years
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The graph shows the radioactive decay of a 50-gram sample of a radioactive isotope.
According to the graph, what is the half-life of this isotope?
100 years
150 years
200 years
300 years
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The length of time required for half of the radioactive atoms in a sample to decay is its...
era
age
half-life
eon
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