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| 1. |
Tritium has a half-life of 12.5 y undergoing beta decay. What fraction of a sample of pure tritium will remain undecayed after 25 y. |
| Answer» Solution :By definition of HALF-life, half of the INITIAL sample will remain undecayed after 12.5 y. In the next 12.5 y, ONE-half of these nuclei WOULD have decayed. Hence, one FOURTH of the sample of the initial pure tritium will remain undecayed. | |