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1/2 life of R 226 if A(t)=600e^-0.00043t
i got stuck
A(t)=A(t)=600e
A(t)=600/2=300
300=A(t)=600e

  • math -

    300 = 600e^-.00043t
    1/2 = e^-.00043t
    -ln2 = -.00043t
    t = 1612

    so, after 1612 years, half is gone. That's the half-life.

    Check: web search reveals a half-life of 1600 years or so.

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