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28 February, 14:57

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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  1. 28 February, 17:16
    0
    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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