PHY 205L M4 Radioactive Dating Game Lab Report

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Feb 20, 2024

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Radioactive Dating Game A. D ATING G AME Now that we understand radioactive decay and half-lives, we can use them to determine how old rocks or fossils are. 1. Download the “Radioactive Dating Game” using either the link provided in the 4-2 Post Lab: Geologic Time and Fossils module or, if the direct link does not work for you, using the following link below: https://phet.colorado.edu/en/simulation/radioactive-dating-game . a. NOTE: In order to run the simulation, you will need the most up-to-date version of Java. If you do not have the most up-to-date version, determine your operating system and click on the associated ‘Java’ link below to download it. Windows Macintosh Linux Microsoft Windows XP/Vista/7/8.1/10 Latest version of Java OS X 10.9.5 or later Latest version of Java Latest version of Java b. If you wish to use an iPad or Android tablet, there is the option to download an App to run the simulation, but it does have an associated cost to it ($0.99). To learn more information or to download the App to your device, click the following link below: https://phet.colorado.edu/en/simulations/category/by-device/ipad-tablet . c. If you run into any issues in downloading or running the simulation, please reach out to Technical Support at (855)877-9919 or using the Live Technical Support Chat feature. 2. Once the simulation is downloaded and open, click the “Dating Game” tab at the top of the screen. 3. To operate the probe, drag it to different items on or below the surface of the earth. The probe tells you how much of the original element is still in the rock or fossil. You can measure C-14 or U-238, whichever works better for the item you are measuring. 4. Use the graph to match the percent of element remaining, and then use the time shown to estimate the age of the rock or fossil. 5. Let’s do an example: a. Drag the probe to the dead tree to the right of the house. b. Look at the probe reading: it tells you that there is 97.4% of the original C-14 remaining in the dead tree. c. Now find the green arrows on the graph at the top of the screen. Drag those arrows right or left until the top line tells you that the C-14 percentage is 97.4%, the reading from the probe. d. When you get the graph to read 97.4%, it tells you that the time has been 229 years. e. Type this number into the box for “Estimate age of dead tree” and click “Check Estimate.” f. You should get a green smiley face, indicating that you have correctly figured out the age of the dead tree. Repeat the above process for all the other items. Fill in the table below. Hint: For the last four items on the list, neither C-14 or U-238 will work well. Select “Custom”, and pick a half-life that gives you something other than 0.0% on the probe. Indicate the half-life used in the “Element Used” column. Item Age Element Used Geologic Era Geologic Period Animal Skull 132 years Carbon-14 House 90 years Carbon-14 Living Tree 0 years Carbon-14 Distant Living Tree 0 years Carbon-14 Bone 1467 years Carbon-14
Wooden Cup 1004 years Carbon-14 Human Skull 2182 years Carbon-14 Fish Bones 15933 years Carbon-14 Rock 1 136.62 MY 100my Rock 2 259.92MY 100my Rock 3 261.39MY 100my Rock 4 319.86MY 100my Rock 5 698.29MY Uranium Fish Fossil 27.27MY 100my Dinosaur Skull 154.97MY 100my Trilobite 309.83MY 100MY Small Human Skull 18388 Carbon-14 Adapted from Kevin Fairchild, La Costa Canyon High School, 2011
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