Question 18 0 out of 1 points A radioactive isotope decays with a half-life of 8.02...
A 0.0116-g sample of a radioactive isotope with a half life of 1.3x109 years decays at the rate of 2.9x104 disintegrations per minute. Calculate the molar mass of the isotope. Enter your answer in scientific notation. (g/mol)
14 C is a radioactive isotope of carbon, which decays with a const ant half-life of 5730 y. If a Megatherium (giant sloth) skull contains 0.011% of the 14 C it did when the animal was alive, how old is the tusk?
A) 13N decays with a half-life of approximately 10 min to produce 13C, a stable isotope of carbon. For a 1.0g sample of 13N, after one half-life, what mass of 13N remains? What has happened to the remaining mass? B) 223Ra decays by alpha emission with a half-life of 11.43 days. For a 1.0g sample of 223Ra, after one half-life, what mass of 223Ra remains? What has happened to the remaining mass?
A radioactive isotope decays by B" emission with a half-life of 1.0 min. During the first 1.0 min, a particular sample emits 1000 B particles. During the next 1.0 min, the number of B- particles this sample will emit will be closest to 250. 500. O 1000. 1500. 2000.
Part A: Tritium is a radioactive isotope of the element hydrogen. Tritium has a half-life of 12.5 years. How many years would it take until only 3.22% of a sample remain? Answer should be in years. Part B: Radioactive Carbon-11 has a half life of only 20.3 minutes and an atomic mass number of 11 u. Calculate the activity of 3.58 g of Carbon-11. Answer should be in Bq.
Radioactive Decay - Half-life and Activity 1 Radioactive decay - Half-life Time 0 1000 21 31 750 N 1.000.000 500,000 250,000 125,000 62,500 31.250 15.625 7813 3.506 1.953 977 51 6 500 7 BI . 101 250 125 0 tie 21.234.41516171819, 1012 Time in multiples of A radioactive sample's half-life is 30.2 years. 1 year = 365 days, 1 day = 24 hours, 1 hour - 60 minutes, 1 minute = 60 seconds (a) Find its decay constant in year...
8. Fermium-253 has a half-life of 0.334 seconds. A radioactive sample is considered to be completely decayed after 10 half-lives. How much time will elapse for this sample to be considered gone? 9. 100.0 grams of an isotope with a half-life of 36.0 hours is present initially. How ma time will have elapsed when 5.00 grams remains? 131 (half-life = 8.040 days) to decay to 10. How long will it take for a 40.0 gram sample of 1-131 (half-life =...
A radioactive sample contains 1.55g of an isotope with a half-life of 3.7 days.Part A:What mass of the isotope will remain after 5.8 days? (Assume no excretion of the nuclide from the body.)Express your answer using two significant figures.
-11 points SHIPPS14 10..018. What is the half-life of a radioactive isotope If the activity of a sample drops from 6,560 cpm to 205 cpm in 24.0 min? min Need Help? Read It
1. 1. Iodine-131 is a radioactive isotope. After 8.00 days, 50.2% of a sample of 131I remains. What is the half-life of 131I? 2. The half-lives of different radioisotopes are given in the table below. If the initial amount of potassium-44 is 9.2 g, how much potassium-44 is left in the body after 44 minutes? 2. 32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 59.9 g of 32P, how much 32P was present...