C14 has a half-life of 5700 years. At the end of 11400 years, the actual amount left is?
Correct answer: C. 0.25 of the original amount
- A. 0.0625 of the original amount
- B. 0.5 of the original amount
- C. 0.25 of the original amount
- D. 0.125 of the original amount
Explanation
2 half-lives have passed so one-fourth of the sample remains.
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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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