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Question: 

What fraction of a sample of ${^{68}_{32}\textrm{Ge}}$ whose half-life is about 9 months, will remain after 2.5 yr?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$0.1$

Giancoli 7th Edition, Chapter 30, Problem 40

(1:12)

Chapter 30, Problem 40 is solved.

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