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29 March, 12:53

You started with 64 g of a radioactive substance. If you have 4.0 g of that substance left, then how many half-lives have elapsed?

a. 2

b. 3

c. 4

d. 5

+1
Answers (2)
  1. 29 March, 15:09
    0
    D for dead cause you aint going to survive with out anti radiation gear.
  2. 29 March, 15:24
    0
    4 half lives have elapsed
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