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## QuestionPhysicsClass 12

Tritium has a half-life of $$12.5y$$  undergoing beta decay. What fraction of a sample of pure tritium will remain undecayed after $$25y$$ .

As per the definition of half-life, half of the initial sample will remain un-decayed after $$12.5 y$$. In the next $$12.5 y$$, one-half of these nuclei would have been decayed. Thus, one fourth of the sample of the initial pure tritium will remain un-decayed.