Homework Help: science

Posted by chuck on Monday, March 5, 2012 at 3:49pm.

The half-life of carbon 14 is 5730 years. if a 1 g sample of old carbon is 1/8 as radioactive as 1 g of a current sample, then the age of the old sample is about ___________years.

22,900

17,200

11,500

716

science - running.from.myself, Monday, March 5, 2012 at 3:51pm
if I am correct, B. 17,200. I looked it up and this is what it said "b.) 17,200

if it takes 5730 years to be half then it takes 2*5730 years to be a quarter and 3*5730 years to be an eighth (2^3=8) so to get an 1/8 you need to half it 3 times and it takes 5730 years to half each time, thus 3*5730 ~ 17,200"
science - Frank, Monday, March 5, 2012 at 4:00pm
Thanks
science - running.from.myself, Monday, March 5, 2012 at 4:02pm
No problem.

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