Half-Life Worksheet

Master half-life! Practice radioactive decay calculations and concepts with this engaging science worksheet.

Half-Life Explanation Watch the half-life explanation to review half-life. What is radioactivity? What is half-life? Fill in the tags using the following terms:parentdaughterhalf-life daughter parent half-life If one half life for the radioactive material is 2500 years, about how much time will have passed once the radioactive material only has 10% remaining? If the half-life of the radioactive element is 10 years, about how much time will pass before the stable element reaches 90%? If we start with 400 atoms of a radioactive substance, how many would remain after one half life? _After 2 half-lives? _After 3 half-lives? _After 4 half- lives? _ If we start with 48 atoms of a radioactive substance, how much would remain after one half-life? _After 2 half-lives? _After 3 half-lives? _After 4 half-lives? _ If we start with 16 pounds of a radioactive substance, how much would remain after 3 half-lives? If we start with 120 atoms of a radioactive substance, how many would remain after 3 half-lives? Radioactive Decay of Curium-246 How long is a half-life for curium-246? If only 25% of the curium-246 remains, how old is the material containing the curium-246? If the sample originally had 120 atoms of curium-246, how many atoms will remain after 14,190 years? If a sample is know to be about 9,460 years old had 400 curium-246 atoms, how many atoms were in the sample when the organism originally died? You take a sample of igneous rock. You find 300g of radioactive element B. It decays into element Z. The half-life of the radioactive element is 5 days. Draw a graph that shows how the amounts of radioactive and stable elements change over 5 half-lifes.