Physics for IGCSE & O level - Atoms And Radioactivity (Section 6 - No. 44)
What does half-life refer to?
The time it takes for an atom to decay completely.
The time it takes for half of a radioactive substance to decay.
The total lifespan of a radioactive atom.
The time it takes for an isotope to become stable.
Explanation
Half-life is the time for half of a sample to decay.
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