ConcepTest: Isotopic Dating with Parent to Daughter Ratios
The half-life of a radioactive isotope is 500 million years. Scientists testing a rock sample discover that the sample contains three times as many daughter isotopes as parent isotopes. What is the age of the rock?
a. 500 million years
b. 1,000 million years
c. 1,500 million years
d. 2,500 million years
No data yet. The correct response is b.
If you would like to help acquire more Before and After statistics for this example, please contact the authors (see link at top of page).
References and Notes:
Historical Geology, Geochemistry:
Resource TypeActivities:Classroom Activity:Short Activity:
Grade LevelCollege Lower (13-14):
Ready for Use
Ready to Use
Earth System Topics
Time/Earth History, Solid Earth:
Chemistry/Physics/Mathematics, Time/Earth History
ThemeTeach the Earth:Teaching Environments:
Intro Geoscience, Teach the Earth:Teaching Topics:
Early Earth, Teach the Earth:Course Topics: