Tree ring dating simulation worksheet

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.However, the carbon-14 that was in the organism at death continues to disintegrate.By measuring how much carbon is left in a sample as well as its radioactivity, we can calculate when the organism died. In this activity, you will work backwards to solve a puzzle, much like scientists work backwards to find the time that an organism died." Procedure Give each student a copy of The Case of the Melting Ice student sheet.This lesson is the third in a three-part series about the nucleus, isotopes, and radioactive decay.The first lesson, Isotopes of Pennies, deals with isotopes and atomic mass.

The lab stations should have been set up already as described in the Planning Ahead section above.

Written below is the case as it appears on The Case of the Melting Ice student sheet.

The Case of the Melting Ice Frosty the Snowman lies melting in the funnels at your lab station.

Living things have about 15 disintegrations per minute per gram of carbon.

Because living things constantly interchange carbon atoms, the amount of carbon-14 remains constant, but when organisms die, no new carbon-14 enters the organism.

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