Physics, 28.08.2019 08:00, almasrim274

The c-14 decay is used to estimate the age of an old dead tree. the activity of c-14 in the dead tree is determined to have fallen to 21% of its original value. c-14 has a half-life of 5700 years. calculate, in years, the age of the dead tree.
i used the relevant formula but somehow my answer does not match with the markscheme. can you me?

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The c-14 decay is used to estimate the age of an old dead tree. the activity of c-14 in the dead tre...