p43_027 - 27. By the definition of half-life, the same has...

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Unformatted text preview: 27. By the definition of half-life, the same has reduced to 1 its initial amount after 140 d. Thus, reducing it 2 to 1 = ( 1 )2 of its initial number requires that two half-lives have passed: t = 2T1/2 = 280 d. 4 2 ...
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