The half-life of a radioactive material is the time required for an amount of this
Chapter 1, Problem 11(choose chapter or problem)
The half-life of a radioactive material is the time required for an amount of this material to decay to one-half its original value. Show that for any radioactive material that decays according to the equation Q_ = rQ, the half-life and the decay rate r satisfy the equation r = ln 2.
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