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Homework Help: Half life of strontium

  1. Nov 18, 2009 #1
    1. The problem statement, all variables and given/known data

    The half life of strontium-90 is 28.0 years. Deduce that the decay constant of strontium-90 is 7.85 * 10^(-10) s^1.

    2. Relevant equations

    k = ln 2 over half-life in seconds

    3. The attempt at a solution

    dunno...please help me solve this!
  2. jcsd
  3. Nov 18, 2009 #2


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    Science Advisor
    Homework Helper

    Well, express 28 years in seconds and divide log(2) by that? I don't know what else to say.
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