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5 August, 17:32

the half-time life of strontium-85 is 64.84 days. how much of a 40 mg sample would be left after 180 days

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  1. 5 August, 17:46
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    about 5.84 mg

    Step-by-step explanation:

    The amount remaining after t days can be written as ...

    remaining = initialAmount · (1/2) ^ (t / (halfLife))

    Filling in the given numbers, you have

    remaining = (40 mg) · (1/2) ^ (180/64.84) ≈ 5.84 mg

    About 5.84 mg would be left after 180 days.
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