Radioactive Dating Game Paper Assignment
Assignment ID Number AFFGEHU83939HD Type of Document Essay Writing Format APA/MLA/Harvard Academic Level Masters/University References/Sources 4 References
Radioactive Dating Game Paper Assignment
Radioactive Dating Game
- Half Life
- Click the “Pause” button at the bottom of the window.
- Click the “Add 10” button below the “Bucket o’ Atoms” repeatedly until there are no more atoms left in the bucket.
- There are now 100 carbon-14 atoms on the screen. The half-life of carbon-14 is about 5700 years. If you left those 100 carbon-14 atoms to sit around for 5700 years, how many would you expect to decay during that time? _________________
- Click the “Play” button at the bottom of the window. Watch the graph at the top of the window carefully. Was your prediction from #3 correct? _____________ Was it close?____________________
- Click “Reset All Nuclei” and then repeat step #4. Was your prediction from #3 correct this time? __________________ Was it close? _________________
- Is radioactive decay an easily predictable process or a statistical process? _________________________
- Decay Rates
- Click the “Decay Rates” tab at the top of the screen.
- On the right side of the screen, click the button next to Uraniam-238. This time we will watch the decay of this atom. Uranium-238 has a half-life of about 4.5 billion years.
- On the bucket of atoms, there is a slider. Drag the slider all the way to the right and watch the graph at the bottom of the screen.
- Fill in the answers in this table:
After one half-life (4.5 billion years), what percent of the original uranium remains? After two half-lives (9 billion years), what percent of the original uranium remains? After three half-lives (13.5 billion years), what percent of the original uranium remains? After four half-lives (18 billion years), what percent of the original uranium would remain?
- Suppose you found a rock, and through testing found out that it had just as much lead-206 as uranium-238 in it. How old would you conclude the rock to be? _____________________________
- Click the “Measurement” tab at the top of the screen.
- Click “Plant Tree” at the bottom of the screen. The tree will grow and live for about 1200 years, then die and begin to decay. Let the time run and watch the graph at the top of the screen.
- According to the graph, what is the percent of C-14 in the tree while it is alive? _______________ Why?________________________________________________________________________________
- According to the graph, approximately how many years has the tree been dead when its C-14 percent is down to 50%?__________________
- According to the graph, approximately how many years has the tree been dead when its C-14 percent is down to about 12.5%?______________________
- Click “Rock” on the right side of the screen. Click “Uranium-238” underneath “Probe Type” in the upper left of the screen. To measure longer times, we need to use an element that decays more slowly than C-14.
- Before you click anything, make some predictions. How much uranium will be remaining when the rock is 4.5 billion years old? ___________________ How much will be remaining when the rock is 9 billion years old? ___________________ How much will be remaining when the rock is 13.5 billion years old?______________________
- Click “Erupt Volcano” to begin the process of creating an igneous rock. Watch the graph at the top of the screen. Check your predictions from #7. Were they correct?_____________________________
- Dating Game
Now that we understand radioactive decay and half-lives, we can use them to determine how old rocks or fossils are.
- Click the “Dating Game” tab at the top of the screen.
- You can drag the probe 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.
- You can 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.
- Let’s do an example:
- Drag the probe to the dead tree to the right of the house.
- Look at the probe reading: it tells you that there is 97.4% of the original C-14 remaining in the dead tree.
- 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.
- When you get the graph to read 97.4%, it tells you that the time has been 229 years.
- Type this number into the box for “Estimate age of dead tree” and click “Check Estimate.”
- 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 House Living Tree Distant Living Tree Bone Wooden Cup Human Skull Fish Bones Rock 1 Rock 2 Rock 3 Rock 4 Rock 5 Fish Fossil Dinosaur Skull Trilobite Small Human Skull
Adapted from Kevin Fairchild, La Costa Canyon High School, 2011
QUALITY OF RESPONSE NO RESPONSE POOR / UNSATISFACTORY SATISFACTORY GOOD EXCELLENT Content (worth a maximum of 50% of the total points) Zero points: Student failed to submit the final paper. 20 points out of 50: The essay illustrates poor understanding of the relevant material by failing to address or incorrectly addressing the relevant content; failing to identify or inaccurately explaining/defining key concepts/ideas; ignoring or incorrectly explaining key points/claims and the reasoning behind them; and/or incorrectly or inappropriately using terminology; and elements of the response are lacking. 30 points out of 50: The essay illustrates a rudimentary understanding of the relevant material by mentioning but not full explaining the relevant content; identifying some of the key concepts/ideas though failing to fully or accurately explain many of them; using terminology, though sometimes inaccurately or inappropriately; and/or incorporating some key claims/points but failing to explain the reasoning behind them or doing so inaccurately. Elements of the required response may also be lacking. 40 points out of 50: The essay illustrates solid understanding of the relevant material by correctly addressing most of the relevant content; identifying and explaining most of the key concepts/ideas; using correct terminology; explaining the reasoning behind most of the key points/claims; and/or where necessary or useful, substantiating some points with accurate examples. The answer is complete. 50 points: The essay illustrates exemplary understanding of the relevant material by thoroughly and correctly addressing the relevant content; identifying and explaining all of the key concepts/ideas; using correct terminology explaining the reasoning behind key points/claims and substantiating, as necessary/useful, points with several accurate and illuminating examples. No aspects of the required answer are missing. Use of Sources (worth a maximum of 20% of the total points). Zero points: Student failed to include citations and/or references. Or the student failed to submit a final paper. 5 out 20 points: Sources are seldom cited to support statements and/or format of citations are not recognizable as APA 6th Edition format. There are major errors in the formation of the references and citations. And/or there is a major reliance on highly questionable. The Student fails to provide an adequate synthesis of research collected for the paper. 10 out 20 points: References to scholarly sources are occasionally given; many statements seem unsubstantiated. Frequent errors in APA 6th Edition format, leaving the reader confused about the source of the information. There are significant errors of the formation in the references and citations. And/or there is a significant use of highly questionable sources. 15 out 20 points: Credible Scholarly sources are used effectively support claims and are, for the most part, clear and fairly represented. APA 6th Edition is used with only a few minor errors. There are minor errors in reference and/or citations. And/or there is some use of questionable sources. 20 points: Credible scholarly sources are used to give compelling evidence to support claims and are clearly and fairly represented. APA 6th Edition format is used accurately and consistently. The student uses above the maximum required references in the development of the assignment. 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Structure of the Paper (worth 10% of total points) Zero points: Student failed to submit the final paper. 3 points out of 10: Student needs to develop better formatting skills. The paper omits significant structural elements required for and APA 6th edition paper. Formatting of the paper has major flaws. The paper does not conform to APA 6th edition requirements whatsoever. 5 points out of 10: Appearance of final paper demonstrates the student’s limited ability to format the paper. There are significant errors in formatting and/or the total omission of major components of an APA 6th edition paper. They can include the omission of the cover page, abstract, and page numbers. Additionally the page has major formatting issues with spacing or paragraph formation. Font size might not conform to size requirements. The student also significantly writes too large or too short of and paper 7 points out of 10: Research paper presents an above-average use of formatting skills. The paper has slight errors within the paper. This can include small errors or omissions with the cover page, abstract, page number, and headers. There could be also slight formatting issues with the document spacing or the font Additionally the paper might slightly exceed or undershoot the specific number of required written pages for the assignment. 10 points: Student provides a high-caliber, formatted paper. This includes an APA 6th edition cover page, abstract, page number, headers and is double spaced in 12’ Times Roman Font. Additionally, the paper conforms to the specific number of required written pages and neither goes over or under the specified length of the paper.
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