Half life dating activity leicester dating websites
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.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.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.For students, understanding the general architecture of the atom and the roles played by the main constituents of the atom in determining the properties of materials now becomes relevant.
Using the decays of uranium and thorium, our galaxy has been found to be between 10 and 20 billion years old and the earth has been found to be 4.6 billion years old. Within experimental error, this estimate agrees with the 15 billion year estimate of the age of the Universe.
They should also understand that the atoms of any element are alike but are different from atoms of other elements.
Atoms may stick together in well-defined molecules or they could be packed together in large arrays.
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.