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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.
Question 2
2.
Question 3
3.
Which is the parent? __________
Question 4
4.
Which is the daughter? __________
Question 5
5.
Question 6
6.
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.
Question 9
9.
Question 10
10.
Which one is the parent?__________
Question 11
11.
Which one is the daughter?__________
Question 12
12.
Question 13
13.
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_______
What is on the X Axis?
Percentage of Lead Remaining
Age in billion of years
Age in million of years
Percentage of Uranium Remaining
What is on the Y Axis?
Age in billion of years
Age in million of years
Percentage of Uranium Remaining
Percentage of Lead Remaining
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
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
What is on the X Axis?
Time in years
Percentage of Nitrogen 14 Remaining
Percentage of Carbon 14 Remaining
Time in million of years
What is on the Y Axis?
Percentage of Carbon 14 Remaining
Percentage of Nitrogen 14 Remaining
Time in million of years
Time in years
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
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
20,000 years
25,000 years
35,000 years
