gamerjoep23 gamerjoep23

15-12-2020
Mathematics

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the half life of radium is 1690 years. if 100 grams are present now, when will there be 20% of the original amount

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emiyahtjones2005 emiyahtjones2005

15-12-2020

Let A=the remaining amount of radium
Let S=the amount of radium you start with
Let t=the amount of time in years
Let h=the half-life time

Then A=S(1/2)^(t/h)
So,
A=80(1/2)^(430/1690)
A=approx. 67g

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