Question: if q(t) is the amount present at time t, then dq/dt =-rQ where r is decay rate, if 450 mg of thorium-234 decays to 62.16mg

if q(t) is the amount present at time t, then dq/dt =-rQ where r is decay rate, if 450 mg of thorium-234 decays to 62.16mg in 10 weeks, determine decay rate

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