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Sara and Beca learn about constructing a half-life graph with the help of both Ada the science app and an early version of Ada. After finding an old phone in her home, Sara shows Beca how the old technology works. The new version of Ada explains how the age of objects can be determined by the rate at which objects decay radioactively. Ada demonstrates to the girls how to construct a half-life graph, which aids the calculation of the rate of decay of these aged objects, such as the old phone.

After watching the animation, use chocolate buttons to model the half-life decay of a radioactive element. Every time you throw the chocolate buttons, when they land flat side up, count these as decayed. Continue to throw the chocolate buttons until all have decayed.

Advanced:

Describe how carbon dating is used to calculate the age of organic materials. Describe if carbon dating is time limited, and why. Use the concept of half-life to describe how and when radioactive materials become safe.