Please help me solve this question:

A layer of peat beneath the glacial sediments of the last ice age had a carbon-14 content of 25% of that found in living organisms. How long ago was this ice age?

2 answers

You will need k and you don't have information to get it. Look up the half life of C-14 which I think is in the neighborhood of 5800 years. Use the exact number when you find it.
Then k = 0.693/t1/2

ln(No/N) = kt
Substitute 100 for No.
N = 25
k from the half life
Solve for t.
.36
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