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Such raw ages can be calibrated to give calendar dates.Perhaps you've heard the expression “multiplying like rabbits,” implying a very rapid increase.One of the most well-known applications of half-life is carbon-14 dating.The half-life of carbon-14 is approximately 5,730 years, and it can be reliably used to measure dates up to around 50,000 years ago.).(Not all the radiation emitted in all directions by a source will collected by a detector lined up in one direction from a source)Student question: An example using the equation Set students the task of drawing a graph for a lab source, e.g. Discussion: The logarithmic form of the equation Point out that a straight line graph is usually more useful than a curve, particularly when dealing with experimental data. Worked example: Using the log equation Start with some experimental data (e.g.from the decay of protactinium), draw up a table of ln (count rate) against time.
Student questions: Practice calculations Your students should now be able to handle a range of questions involving both e and ln functions.
The following tools can generate any one of the values from the other three in the half-life formula for a substance undergoing decay to decrease by half.
Please provide any three of the following to calculate the fourth value.
The process of carbon-14 dating was developed by William Libby, and is based on the fact that carbon-14 is constantly being made in the atmosphere.
It is incorporated into plants through photosynthesis, and then into animals when they consume plants.The carbon-14 undergoes radioactive decay once the plant or animal dies, and measuring the amount of carbon-14 in a sample conveys information about when the plant or animal died.