What fraction of the sample will be left over, Physics

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Q. Tritium has a half life period of 12.5 years. What fraction of the sample will be left over after 25 years?

HLP = 12.5 years

Number of HLPs in 25 years = 25 / 12.5 =2

Fraction of the sample left over after 25 years = (½) 2 = ¼


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