Physics for IGCSE & O level - Atoms And Radioactivity (Section 8 - No. 19)
What does the term 'half-life' refer to in the context of radioactive decay?
The time it takes for the element to disappear entirely.
The time it takes for half of the radioactive material to decay.
The time it takes to double the amount of the radioactive material.
The time it takes to reach a stable atomic configuration.
Explanation
Half-life is the time required for half of a radioactive substance to decay.
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