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The decay constant of ^238Uis 4.9xx10^-1...

The decay constant of ``^238U`is `4.9xx10^-18 s^-1.`(a) What is the avarage-life of``^238U`?(b)What is the half-life of ``^238U`?(c) By what factor does the activity of s ``^238U` sample decreases in `9xx19^9` years?

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