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October 2, 2014

October 2, 2014

Posted by **bubb** on Wednesday, June 30, 2010 at 11:13am.

the half life of carbon-14 is 5730 years, the relation c+(1/2)^ N/5730 is used to calc. the concentration, c, in parts per trillion remaining n years after death determine the carbon concentration in a 11460 year old bone.

please help :)

- half-life -
**DrBob222**, Wednesday, June 30, 2010 at 11:30amYou must be kidding. No capitals to begin the sentence and no periods at the end of a sentence. I can't find the question. But I can tell it's a half-life question.

I don't use your formula. I used a revised version which always gives the same result.

Calculate k. k = 0.693/t_{1/2}

Then substitute k into the following.

ln(No/N) = kt

k is from above.

No is what you started with. I would assume a value of 1

N is what is left.

t is the time in the problem.

Post your work in readable form if you get stuck.

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