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Half-Life and Ages of Rocks
By Bonnie Coldiron
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Last updated about 3 years ago
14 questions
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This is the radioactive decay curve for Uranium-238 decaying into Lead-206.
Question 1
1.
What is on the X Axis?
Percentage of Lead Remaining
Age in billion of years
Age in million of years
Percentage of Uranium Remaining
Question 2
2.
What is on the Y Axis?
Age in billion of years
Age in million of years
Percentage of Uranium Remaining
Percentage of Lead Remaining
Question 3
3.
Which is the parent? __________
Question 4
4.
Which is the daughter? __________
Question 5
5.
Use the graph to find the ages of rocks
Rock A has 88% of Uranium left. What is its age?
1
1 Million
1 Billion
Question 6
6.
Use the graph to find the ages of rocks
Rock B has 76% Uranium left. What is its age?
3 Billion
2.5 Billion
2 Billion
1.5 Billion
Question 7
7.
Use the graph to find the % of Uranium in the rock
Rock C is 12 billion years old. What is the percentage of Uranium left in the rock_______
must include percent sign
This is the radioactive decay curve for Carbon 14 decaying into Nitrogen 14.
Question 8
8.
What is on the X Axis?
Time in years
Percentage of Nitrogen 14 Remaining
Percentage of Carbon 14 Remaining
Time in million of years
Question 9
9.
What is on the Y Axis?
Percentage of Carbon 14 Remaining
Percentage of Nitrogen 14 Remaining
Time in million of years
Time in years
Question 10
10.
Which one is the parent?__________
Question 11
11.
Which one is the daughter?__________
Question 12
12.
Use the graph to find the ages of rocks
Rock D contains 30% of Carbon 14? What is the age of the rock?
10 years
5,000 years
10,000 years
15,000 years
Question 13
13.
Use the graph to find the ages of rocks
'Human Bone A' contains 5% of Carbon 14? What is the age of the rock?
10 years
5,000 years
Question 14
14.
Use the graph to find the % of Carbon 14 in the rock
'Human Bone B' is 30,000 years old. What is the percentage of Carbon 14 left in the rock_______
20,000 years
25,000 years
35,000 years
