Key term for OCR GCSE Physics A, used in Uses and hazards.
The time taken for the number of unstable nuclei of an isotope in a sample to decrease by half, or for the activity to fall to half its initial level.
Half-life appears in OCR GCSE Physics A revision content for Radioactivity, especially Uses and hazards and Hazards and half-life.
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Radioactivity
Radioactive emissions • Half-life calculations
