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22 September, 11:57

If the half-life of a sample of a radioactive substance is 30 seconds, how much would be left after 60 seconds?

a. one-fourth

b. half

c. one-eighth

d. you would need to know how many atoms you are starting with.

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Answers (1)
  1. 22 September, 15:51
    0
    The answer is a. one-fourth
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