Half life dating activity
The last figure I heard was that there are currently eight nuclear subs on our ocean floors. It doesn't work for sea creatures and other things that are under water. Then they measure how much is left in the specimen when they find it.
It comes from cosmic rays that rain down on the earth (and us) from outer space.
Technology also provides tools for investigations, inquiry, and analysis.
Each atom has a positively charged nucleus surrounded by negatively charged electrons.After each "half life", count the people remaining standing and plot it on a piece of graph paper on the overhead.After about 3 or 4 "half-lives" ask students to predict what's going to happen to the numbers of remaining parent isotopes.The demonstration usually takes approximately 5-10 minutes depending on how long it takes to count the students.If your class is particularly large, you might want to have a few students help you count the "undecayed" isotopes.
Before class begins, prepare five bags filled with about 100 beads each.