Explanation: 1/32 = 1/2^5, so the fossil has aged for 5 half lifes. Assuming the half life is 5,730 years, that's 5 xx 7,730 = 28,650 years old. Answer link. 5 half lifes (half lives?) 1/32 = 1/2^5, so the fossil has aged for 5 half lifes. Assuming the half life is 5,730 years, that's 5 xx 7,730 = 28,650 years old. Wikipedia says that the half-life of Uranium-$235$ is $7.038 \times 10^8$ ($\text{703 800 000}$) years. This is very long. Therefore, on a human time scale, the decay is very small, posing difficulty for determining the half-life. So Who and how was the half-life calculated? This continues until the entire sample of iodine-131. has completely decayed (see figure below). Figure 10.3.1 10.3. 1: The half-life of iodine-131 is eight days. Half of a given sample of iodine-131 decays after each eight-day time period elapses. Half-lives have a very wide range, from billions of years to fractions of a second. For an atom with a half-life of 3 minutes, in a 200-atom sample, approximately 6.25 atoms will remain after 15 minutes or 5 half-lives. In each 3-minute interval or half-life, the number of existing atoms is halved from the remaining sample. Explanation: The question entails the half-life decay process for Po-218, a radioactive atom. .

how much is half life 2