Posted by hannah on Tuesday, November 12, 2013 at 6:52pm.
1.The remains of an old campﬁre are unearthed and it is found that there is only 80% as much radioactive carbon14 in the charcoal samples from the campﬁre as there is in modern living trees. If the halflife of carbon 14 is 5730 years, how long ago did the campﬁre burn?

math  Kuai, Wednesday, November 13, 2013 at 12:36am
Po = Poe^kt
1/2 = e^5730k
Ln(1/2) = Lne^5730k
Ln(1/2) = 5730k
K = ln(1/2)/5730
Poe^ln(1/2)/5730 *t
.80P0 = Poe^ln(1/2)/5730 *t
.8 = e^ln(1/5)/5730 t
ln(.8) = ln(.5)/5730t lne
ln(.8) = ln(.5)/ 5730 t
t = 5730ln(.8)/ln(.5)

math  Chris, Tuesday, March 10, 2015 at 11:44pm
t=1844.65 years

math  ساره, Thursday, March 24, 2016 at 8:28am
found in an Egyptian pyramid contains 75% of its original carbon_14 which has about 5730 years as halflife.
Answer This Question
Related Questions
 Chemistry  A sample of charcoal is found to have only 1/8th of Carbon14. Half...
 Science  Choose the explanation that does the following: (1) identifies the ...
 chemistry  Radioactive waste is difficult to dispose of due to the long time ...
 Chemistry  The halflife for radioactive decay of 14C is 5730 years (it emits...
 Calc II  Carbon14 has a halflife of 5700 years. The charcoal from a tree ...
 physics  A cylindrical ﬁshing reel has a mass of 0.899 kg and a radius ...
 ChemB  measurements of carbon 14 taken from linen wrappings of the book of ...
 math  only 5% of the carbon14 in a small wooden bowl remains , how old is the ...
 MATH  A track meet awards 6, 5, 4, 3, 2 and 1 points for 1st, 2nd, 3rd, 4th, ...
 College Algebra  Carbon14 Dating. Only 10% of the carbon14 in a samll wooden ...
More Related Questions