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10 September, 00:29

Y=

2) lodine-131 has a half-life of about 8 days. Find the amount left

from a 30-gram sample after 40 days.

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Answers (1)
  1. 10 September, 00:51
    0
    15/16 gram

    Step-by-step explanation:

    40 days represents 40/8 = 5 half-lives. That is, the quantity remaining is (1/2) ^5 = 1/32 of the original amount, so is ...

    (30 g) / 32 = 15/16 g
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