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Activity
Exploratorium

Radioactive Decay Model

For Teachers 9th - 12th
Toss 100 pennies (or poker chips or any other two-different-sided objects) and remove all of those displaying tails. Line them up and repeat. The lines of pennies collected get smaller each time, successfully representing half-life.
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Lesson Plan
Curated OER

Forms of Exponential Expressions

For Teachers 9th - 12th Standards
Your young physicists analyze the forms of four equivalent exponential expressions representing an amount of a radioactive material in a substance. They show how each expression is equivalent to the others and what aspects of the decay...

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