Homework Help: Science

Posted by Owen on Wednesday, December 5, 2012 at 9:09pm.

A radioactive substance is found to register 1000 counts per second on a Geiger counter. Twenty-four hours later it registers 125 counts per second. What is its half-life?

Science - Steve, Wednesday, December 5, 2012 at 11:40pm
125 is 1000/8, so that would be 3 half-lives.

24/3 = 8 hours

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