Posted by Stephanie on Friday, October 31, 2008 at 7:23pm.
half is gone after 4 days, so 1/2 is left or 10 grams
in the next 4 days, half of ten grams is lost so 5 grams is left
Just a word of caution on the wording and me being pedantic. The half life is referring to the original isotope so I like to see the answer referring to this. The mass of the sample may have changed only very slightly.
That's a VERY good point and one which I often ignore. Although I didn't respond to this query, I'm glad Dr Russ brought out this point because I think it IS ignored in most instances. And the reason it is ignored, I think, is that some actually don't realize this very point.
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