Physics for IGCSE & O level - Atoms And Radioactivity (Section 4 - No. 18)
What is the approximate half-life of a radioactive substance?
The time it takes for all atoms to decay.
The time it takes for half of the atoms to decay.
The time it takes for a quarter of the atoms to decay.
The time it takes for the substance to become stable.
Explanation
Half-life is the time required for half of the radioactive substance to decay.
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