The time taken for half the number of atoms of radioactive isotopes to missing is called:
Correct answer: D. Half-life
- A. Average life
- B. Mean life
- C. Total life
- D. Half-life
Explanation
Radioactive materials consist of unstable atoms that decay over time, emitting radiation in the process. The rate of decay for each radioactive isotope is unique and can be characterized by its half-life.
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About Half-life and Rate of Decay
Half-life is the time required for half the unstable nuclei in a sample to decay, and it remains constant for a particular radioactive nuclide. Questions use the exponential decay law, decay constant, activity, remaining quantity and mean life. Radioactive decay is random for individual nuclei but predictable for large samples.
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