The isotope Francium 224 has a half life of 20 minutes. A sample of the isotope has an initial activity of 9-- disintegrations s^-1. The approximate activity of the sample an hour later will be what? Multiple choice question. Please explain why for answer

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Answer 1 · 2017-05-12T06:33:36

The number of disintegrations is #A_0/8#

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The half life is #T=20mn#

The time is #t=60mn#

So, we have #3# half life, the activity will be multuplied by #1/8#

The number of disintegrations is #A_0/8#