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21-02-2020
Mathematics

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The half-life of radium is 1690 years. If 20 grams are present now, how much will be present in 250 years?

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sqdancefan sqdancefan

21-02-2020

Answer:

18.05 g

Step-by-step explanation:

The multiplier of the initial quantity is ...

(1/2)^(t/1690)

so, for t=250, this becomes ...

(1/2)^(250/1690) ≈ 0.902545

Then the quantity remaining of the initial 20 g is ...

(20 g)(0.902545) ≈ 18.05 g

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