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OpenStudy (anonymous):

A radioactive isotope has an activity of 9.18 mCi. After 3.85 hours the activity is 6.24 mCi. What is the half-life of the isotope?

OpenStudy (amriju):

hint: dN/dt=kN N: number of particles proportional to radioactivity Solve the equation, find when N=N'/2..N' being the initial population of particles thats proportional to initial activity

OpenStudy (amriju):

hey..dN/dt=-kN

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