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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?
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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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