Physics for IGCSE & O level - Atoms And Radioactivity (Section 7 - No. 38)
What does the term 'half-life' refer to?
The time it takes for an element to decay completely.
The time it takes for half of the radioactive atoms in a sample to decay.
The time it takes for all atoms in a sample to decay.
The time it takes for a sample to reach its maximum radiation.
Explanation
Half-life is the time for half of the radioactive atoms to decay.
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