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24 June, 16:03

A 90 g sample of plutonium-238 has a half-life of 88 years. How long will it take for this sample to decay to

40 g?

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  1. 24 June, 16:18
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    The equation to solving this is 90/40 = 88 / X

    knowing this I multiply 40 and 88 and 90 and x. I got 3520 and 90x. Now I divide 3520 by 90 and I get 39 and 1/9. So the time for the sample to decay is:

    39 1/9 years.
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