Class Activity_Ch 09_Dating Game
.docx
keyboard_arrow_up
School
Florida Gulf Coast University *
*We aren’t endorsed by this school
Course
1000C
Subject
Astronomy
Date
Apr 3, 2024
Type
docx
Pages
3
Uploaded by BaronKnowledge39017
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.
6.
Next, click on the tab for Decay Rates. (Be sure Carbon-14 is selected at the right.) Place 1000 C-14 atoms onto the screen by sliding the slider on the bucket all the way to the right.
a.
Stop the decay at one half-life. (You may need to click “Reset All Nuclei” and run this again a few times before you’re able to stop it at exactly one half-life.) How many Carbon-14 atoms remain? 490
b.
Restart the simulation. After 2 half-lives, how many Carbon-14 atoms remain? 250
c.
Restart the simulation. After 3 half-lives, how many Carbon-14 atoms remain? 140
7.
Now it’s time to play the Radioactive Dating Game! Watch this short video on how to use the different tabs available in the game: https://www.youtube.com/watch?v=cd9tirxLUM4
Object
Carbon-
14?
Uranium-
238?
Other
Isotope?
% of
Original
Predicted Age (yrs)
Measured Age
(yrs)
Animal Skull
yes
no
no
98.2
132
132
Living Tree
Yes
No
No
100
0
0
Distant Living Tree
Yes
No
No
100
0
0
House
Yes
No
No
99.1
85
85
Dead Tree
Yes
No
No
97.4
217
217
Bone
Yes
No
No
83.9
1452
1452
Wooden Cup
Yes
No
No
88.2
1043
1043
1st human skull
Yes
No
No
76.6
2224
2224
2nd human skull
No
No
Yes
75.8
40777
40777
Fish Bones
yes
No
No
14.4
16011
16011
Fish Fossil 1
No
No
Yes
14.4
27940000
27940000
Rock 1
No
Yes
No
97.9
157000000
157000000
Dinosaur Skull
No
No
Yes
34.2
152920000
152920000
Rock 2
No
Yes
No
96
263150000
263150000
Trilobite
No
No
Yes
11.7
309490000
309490000
Rock 3
no
yes
no
93.3
461,560,000
461,560,000
Rock 4
no
yes
no
89.4
721290000
721290000
Rock 5
no
yes
no
82.3
1,240,000,000
1,240,000,000
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help