question archive How long will it take before twenty percent of our 1,000-gram sample of uranium-235 has decayed?  The decay equation is A(t)=A_0e^{Kt} , where t is the time for the decay, and K is the characteristic of the material

How long will it take before twenty percent of our 1,000-gram sample of uranium-235 has decayed?  The decay equation is A(t)=A_0e^{Kt} , where t is the time for the decay, and K is the characteristic of the material

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How long will it take before twenty percent of our 1,000-gram sample of uranium-235 has decayed?

 The decay equation is A(t)=A_0e^{Kt} , where t is the time for the decay, and K is the characteristic of the material. Suppose T is the time it takes for half of the unstable material in a sample of a radioactive substance to decay, called its half-life. Prove that K= \frac{ln0.5}{T} . What is T for the uranium-235? 

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