Half-lives 3

Master half-life calculations for radioactive decay. Understand how isotopes transform over time in this engaging science worksheet!

A 50 g sample of N-16 decays to 12.5 g in 14.4 s. What is its half-life? Step one, determine the number of half lives. Use only the number of rows needed to answer the question. Do not include units on amount. number of half-lives Amount (grams) 0 50 1 25 2 12.5 A 50 g sample of N-16 decays to 12.5 g in 14.4 s. What is its half-life? 28.8 s 14.4 s 7.2 s 3.6 s If 100 g of Au-199 decays to 6.25 g in 10.8 days, what is the half-life of Au-199? Step 1, determine the number of half lives using the table below. As before enter the number for the amount, do not include a unit. Number of Half-lives Amount (in grams) 0 100 1 50 2 25 3 12.5 4 6.25 If 100 g of Au-199 decays to 6.25 g in 10.8 days, what is the half-life of Au-199? 10.8 days 5.4 days 2.7 days 1.35 days The half-life of carbon-14 is 5730 years. What percentage is left after 17190 years? Fill in only the rows you need Half-Lives Percent (number only 0 100 1 50 2 25 3 12.5 The half-life of carbon-14 is 5730 years. What percentage is left after 17190 years? 50 25 12.5 6.25