87Ra221 is a radioactive substance having half-life of 4 days. Find the probability that a nucleus undergoes decay after two half-lives.
Correct answer: C. 3/4
- A. 1
- B. 1/2
- C. 3/4
- D. 1/4
Explanation
Correct option is C. The correct solution is given as:
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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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