Question
if a egyptian mummy has 61% carbon-14 how long ago was it buried?
Take a 100 g initial sample. Now there are 61 g C-14.
Use ln(No/N) = kt
where No = 100
N = 61
You will need k and you may obtain that from k = 0.693/t<sub>1/2</sub>.
Look up t<sub>1/2</sub> and substitute in that equation to find k, then substitute k in the first equation I listed. Post your work if you get stuck.
Take a 100 g initial sample. Now there are 61 g C-14.
Use ln(No/N) = kt
where No = 100
N = 61
You will need k and you may obtain that from k = 0.693/t<sub>1/2</sub>.
Look up t<sub>1/2</sub> and substitute in that equation to find k, then substitute k in the first equation I listed. Post your work if you get stuck.