Class Activity_Ch 09_Dating Game
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Florida Gulf Coast University *
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1000C
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Astronomy
Date
Apr 3, 2024
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docx
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3
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Florida Gulf Coast University Introduction to Earth Science
ESC1000C, Fall Semester, 2023
Chapter 09 – Deep Time – The Dating Game
Your name
: Dylan Singleton
Names of other students
in your group: Relative Dating:
Now put all of the principles you’ve learned to work. Below are relative dating outcrop diagrams that represent sections
of rock. Each letter represents the deposition of a different layer of sedimentary rock or geologic event. Use the
principles of relative dating and unconformities to determine the sequence of events for each diagram below.
The subscript letters stand for igneous dikes (D), faults (F), and unconformities (U). The colors for each unit are from the
geologic time scale. Hint: it is easier to start with the oldest event and work your way forward through time!
Diagram
Sequence (oldest event starts at 1)
1.N
2.A
3.T
4.Gd
5.Ju
6.S
1.Y
2.T
3.E
4.Q
5.C
6.M
7.Gu
8.H
9.N
10.Rd
11.Su
12.V
Radioactive Dating:
You will use the radioactive decay rate and original-daughter element ratios of Carbon-14 and Uranium-238 to determine the ages of different objects.
1.
Use the table to answer the following two questions:
a.
The half-life for Carbon-14 is 5730 years.
b.
The half-life for Uranium-238 is 4.5 Billion years.
Now go to this website: https://phet.colorado.edu/sims/cheerpj/nuclear-physics/latest/nuclear-physics.html?
simulation=radioactive-dating-game
2.
Click on the tab for Half Life and click the button next to Carbon-14. Drag one C-14 atom out of the bucket and drop it in the white space. Watch the graph at the top as it decays to the daughter atom N-14. What was the approximate half-life of this one atom? 6000 years
3.
Drag the N-14 atom back into the Bucket o’ Atoms and click “Reset All Nuclei.” Repeat the process in question #2. What was the approximate half-life of this one C-14 atom? 8000 Years
4.
Now click on the “Add 10” button under the bucket and watch the results in the graph at the top as they decay. Describe the results you observe (using words, not numbers): They moved on different paths and they dropped at different times.
5.
Finally, click on the “Add 10” button 10x and then click “Reset All Nuclei.” Watch the results on the graph at the top.
Use what you have observed to explain how the half-life of C-14 presented in Table 22.2 was determined (or any half-life, for that matter):
They totaled out the average and there was a lot of activity.
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