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3 December, 06:58

How long will it take for a 40.0 gram sample of i-131 (half-life = 8.040 days) to decay to 1/100 its original mass?

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  1. 3 December, 10:20
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    (1/2) ^n = (1/100) n=6.645 Time taken = n*halflife. = 6.645*8.040days = 53.426days
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