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March 30, 2017

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In 10 years, 25% of a radioactive substance decays. What is its half-life?

A. 25 years
B. 24 years
C. 20 years
D. 29 years

  • Math - ,

    (1/2)^(10/x) = .75
    x = 24

  • Math - ,

    You first have to find your rate

    .75 = e^ (r)(10)

    Then find the time for half- life

    .5 = e^ (r from above)(t)

  • Math - ,

    Thanks

  • Math - ,

    24

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