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A radioactive material decays according to the law of natural decay and its mass m(t)m(t) satisfies the differential equation dm/dt=0.53mdmdt=0.53m where t is measured in

A radioactive material decays according to the law of natural decay and its mass m(t)m(t) satisfies the differential equation dm/dt=0.53mdmdt=0.53m where t is measured in years. Its half-life is

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