(Solved): Carbon-14 is a radioisotope that is used for dating biological organisms. The half-life of C-14 is ...

Carbon-14 is a radioisotope that is used for dating biological organisms. The half-life of C-14 is 5730 years. When a \( 1 \mathrm{~g} \) sample of carbon from fresh peat is measured for radioactivity, 900 beta decays are reconded every hour. A 1 gsample of carbon is obtained from a peat deposit and is measured for radionctivity. If 113 beta decays are observed every hour, how many half-lives of C-14 have passed since the deposit was formed? 3 8 113 \( \frac{1}{8} \) Approximately bow old is the peat deposit? 45840 years 716 years: 5617 years 17190 years Another \( 1 \mathrm{~g} \) sample is obtained from a different peat deposit at a different site. If 56 beta decays are measured every bour, about how ofd is this sample? 320880 years: 91680 years 5674 years 22920 years