Posted by L.Bianchessi on .
measurements of carbon 14 taken from linen wrappings of the book of isaiah from the dead sea scrolls indicate that the scrolls contain 79.5% of the carbon 14 expected in living tissue. how old are these scrolls if the half life of carbon 14 is 5730 years? All radioactive decay is first order.

ChemB 
DrBob222,
k = 0.693/t_{1/2}
Then
ln(No/N) = kt
No = 100
N = 79.5
k from above
solve for t in years.