If an ancient campfire were analyzed, was found to have only about one-eighth the carbon-14 that is normally found in living things, how long ago was that campfire extinguished? Answer in units of y.
Radioactive decay : amount of radioactive carbon remain :
Since found carbon atom is 1/8 of normally found in living things
it implies that :
and
so putting values in equation :
so age of campfire :
t =17,190 years
So campfire has been extinguished for 17190 years .
Note : There is a simple trick to solve the
problem that is since sample is 1/8 of normally found so it implies
that sample ( campfire) has been gone through 3 half life time
decay so it’s age : = (3 * half life time of C-14) =(3*5730 years )
= 17190 years
If an ancient campfire were analyzed, was found to have only about one-eighth the carbon-14 that...
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