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Consider two nuclei of the same radioactive nuclide. One of the nuclei was created in a supernova explosion 5 billion years ago. The probability of decay during the next time is.

1. Different for each nuclei
2. Nuclei created in explosion decays first
3. Nuclei created in the reactor decays first
4. Independent of the time of creation

Correct answer: Independent of the time of creation

Solution

For a given nuclide, each nucleus has the same decay constant, so the probability of decaying in the next interval depends only on that constant and the interval length. The age or time of creation does not change the decay probability for the next moment.

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