college physics part 2
posted by Mimi .
the activity of a sample of carbon has one-eighth of the initial activity. carbon-14 has a half-life of 5730 yr. how old is the sample in yr?
one eighth is three half-lives.
Now the hard way:
amount left=original amount(1/2)^t/thalflife
or even harder:
ln of each side
ln (1/8)=-.693 t/th
the question ask how old is the sample in yr. so that mean t/th is 3 yrs.