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Question: 

A radioactive material produces 1120 decays per minute at one time, and 3.6 h later produces 140 decays per minute. What is its half-life?

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

Quick Answer: 

$1.2 \textrm{ hr}$

Giancoli 7th Edition, Chapter 30, Problem 39

(2:26)

Chapter 30, Problem 39 is solved.

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