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Radioactivité


Go to solution Solved by Lénouillette,

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  • Ancien Responsable Matière
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Posted

Salut !

La période vaut T1/2 = ln(2)/\lambda soit 10 secondes. A t0 + 30 secondes, 3 périodes se sont écoulées, donc l'activité du père est diminuée d'un facteur 2^3 = 8.

A = 1*10^5 / 8 = 12 500. Il reste 12 500 atomes de père au bout de 3 périodes.

Le nombre d'atomes fils formés correspond à A0 - nombre de noyaux pères = 1*10^5 - 12 500 = 87 500 atomes fils, soit 8,75*10^4 atomes fils.

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