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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 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.

"Carbon-14 undergoes beta decay with a half-life of 5720 years.

The first lesson, Isotopes of Pennies, deals with isotopes and atomic mass.

The exercise they will go through of working backwards from measurements to age should help them understand how scientists use carbon dating to try to determine the age of fossils and other materials.

To be able to do this lesson and understand the idea of half-life, students should understand ratios and the multiplication of fractions, and be somewhat comfortable with probability.

Students should answer the questions on their student sheet based on their graphs and the data they collected.

Students can check their answers by going to the Radiometric Dating page by Professor Pamela Gore from the Georgia Perimeter College.

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There were no eyewitnesses, but there are several suspects. You need to determine the exact time at which Frosty was put into the funnels to melt away, leaving no trace.

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