Science

Radioactive Decay Core

Radioactive decay is a spontaneous nuclear transformation. For a large population of identical unstable nuclei, the number remaining follows an exponential law. The decay of an individual nucleus is unpredictable, yet a large population obeys a remarkably precise statistical law.

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Connect the idea on this page with one concrete situation. Name the quantity, particle or phenomenon involved, then ask what would change if one variable increased while the others stayed fixed.

Use a simple value first. Predict the direction of the result before calculating, then check units and order of magnitude. If the number is surprising, investigate the model before trusting the calculator.