- Half-life and carbon dating (video) | Nuclei | Khan Academy
- Half-Life : Paper, M&M’s, Pennies, or Puzzle Pieces
- Half-Life Experiment: Coin Toss
- Half-life and carbon dating
When your group has finished, record your results on the board. Once the rest of the class has filled in their data, add up the results from each group for each trial.source site
Half-life and carbon dating (video) | Nuclei | Khan Academy
Then determine the percent of heads left after each trial. Write the percent in the Data Table in the Class Result section. Make TWO line graphs showing the percent of heads remaining. The number of trials is on the X-axis starting with Trial 0 and the percent of heads left is on the Y-axis. The first graph should show the class results as a percentage and the second graph should show the theoretical percent that should have remained.
You do not graph your individual results. Why is radioactive Carbon 14 used to determine the age of fossils? Why were pennies and not actual Carbon used in this activity? What does the term half-life mean - in reference to radioactive substances? A fossil jawbone from a hominid contains 10 mg. How many half-lives has the Carbon14 in this fossil bone gone through?
How old is the artifact from question 4? If another fossil bone contained 2. If a fossil bone is estimated to be about 40, years old, how many half-lives has the Carbon in this fossil bone gone through? Ch 13 pg 66 Radioactive decay used as a clock. Unit 9 Optional Review: Page , 23, 24, 28, 29 Carbon film. Radioactive decay with exponentials.
Half-Life : Paper, M&M’s, Pennies, or Puzzle Pieces
Decay in theory and practice. File - Gander biology. Physics 11 Nuclear Physics Review Worksheet.
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Radioactive decay of thoron. By measuring how much carbon is left in a sample as well as its radioactivity, we can calculate when the organism died. It's a way of working backwards to solve a puzzle. In this activity, you will work backwards to solve a puzzle, much like scientists work backwards to find the time that an organism died. You may group them in any size group, but working in pairs is optimal for this exercise. The lab stations should have been set up already as described in the Planning Ahead section above.
Students should complete the Analysis section of the lab sheet, which will be used as part of their assessment. Advise students to read through the case first so that they understand what they should do. Written below is the case as it appears on The Case of the Melting Ice student sheet. There were no eyewitnesses, but there are several suspects. All the suspects have holes in their alibis. You need to determine the exact time at which Frosty was put into the funnels to melt away, leaving no trace.
Half-Life Experiment: Coin Toss
On a separate sheet of paper, immediately record the volume of Frosty's melted remains water in your graduated cylinder and note the time on the clock. Make a data table and, at regular intervals you decide how long , record the time on the clock and the volume of water in the graduated cylinder. Stop after about 30 minutes, unless Frosty has completely melted earlier.
Students should answer the questions on their student sheet based on their graphs and the data they collected. This page has been archived and is found on the Internet Archive. In addition to using answers to students' Analysis questions and their graphs for evaluation, consider having them respond to the following in their science journals or as a homework essay: Pretend you are on a month-long field trip to dig for artifacts that might have been left from the pre-colonial period in the United States. Write a letter to a friend explaining what radiocarbon dating is.
Be sure to include how radiocarbon dating works backwards to solve a puzzle. Explain to your friend how you and other archaeologists, with the help of chemistry, determine how old your discoveries are.
The Nobel Prize in Chemistry Presentation Speech , given at the presentation of the Nobel Prize to professor Willard Libby for his use of carbon, highlights how the dating method works. Willard Libby , from the Inventor of the Week Archive, profiles the career of the American chemist who created the carbon dating method.
Frosty the Snowman Meets His Demise: Did you find this resource helpful? Other Lessons in This Series 1. Isotopes of Pennies 2.
Half-life and carbon dating
A Sweet Simulation of a Half-life 3. An Analogy to Carbon Dating. Have you tried this lesson?