(show all your works and please do all questions from part a to part c. Sorry fo

Question

(show all your works and please do all questions from part a to part c. Sorry for long questions, but I will give thanks to anyone who can help me all questions from part a to part c)

a. radioisotope dating depends on constant rate of decay and formation of various nuclides in a sample. how is the proportion of carbon-14 kept ralatively constant in organisms

b. how old does a sample have to be before the carbon dating methods becomes unreliable

c. a Geiger counter measures the radioactivity of carbon-14 in a living plant sample at 15.4 disintegration's per second. if the half-life of carbon-14 is 5730yrs, how old is a scroll found in the Dead Sea area of the Middle East if the Geiger counter measured it's carbon-14 radioactivity at 11.5 disintegration's per second

Explanation / Answer

c.   K = 0.693/t1/2

    K   = 0.693/5730   = 0.00012 years-1

K   = 2.303/t log[A0]/[A]

0.00012 = 2.303/t log15.4/11.5

0.00012   = 2.303*0.1268/t

t             = 2.303*0.1268/0.00012 = 2433.5 years

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