8. Fermium-253 has a half-life of 0.334 seconds. A radioactive sample is considered to be completely...
Modeling radioactive decay in pennies MODELING RADIOACTIVE DECAY WITH PENNIES ADVANCED STUDY ASSIGNMENT MODEL 2: RADIONUCLIDE HALF-LIFE The time required for half of a sample of a radionuclides (radioactive isotopes) to decay is called the half-life (units of time). Table 2 below illustrates the half-lives of several radioisotopes and the Table 2: Half-lives of some Radioisoto barium-131 carbon-14 chromium-51 cobalt-60 iodine-131 uranium-238 Radiation Half-life 11.6 days 5730 yrs 27.8 days 5.3 yrs 8.1 days 4.47. 109 yr Application detection of...
lodine 131 has a half life of 8 days and decays by a first order process (as is always the case for radioactive decay). How much of a 46 gram sample of iodine 131 will remain after 8 days? Report your answer in grams.
A certain radioactive nuclide has a half life of 50.7 years. How long does it take for 87.5% of a sample of this substance to decay? years Submit Hide Hints Hint 1 Hint 4 Hint 3 Hint 2 What percentage of the original sample has decayed after two half lives have elapsed?
If a radioactive isotope has half-life h, then the number of atoms in a sample is given by a(t)=a-2-/h where ao gives the number of atoms in the sample at time 0. The radio active decay of carbon-14 leads to clever way of determining the age of fossils and remnants of plants and animals. When an organism dies, the radioactive carbon- 14 in it decays, with half of it gone in 5,730 years. a. Suppose a mummified cat has a...
The decay of radioactive cadmium follows first-order kinetics. A sample of radioactive cadmium has a half life of 15 days. If you have a sample that originally weighed 40 g and later weighs 2.5 g, how much time elapsed between the initial and final masses? A. 45 days B. 600 days C. 60 days D. 100 days
Part A How many half-lives must elapse until 88 % of a radioactive sample of atoms has decayed? Express your answer using two significant figures 10 AED – O @ ? Submit Request Answer Part B How many half-lives must elapse until 97 % of a radioactive sample of atoms has decayed? Express your answer using two significant figures. IVO AXP = 0e? 1/2 Submit Request Answer Provide Feedback
A Radioactive sample contains 2.1g of an isotope with a half- life of 3.8 days. How much of the isotope in grams will remain after 10.0 days? Express the answer to 3 significant figures.
(Can you show work for these questions) If a radioactive material decomposes with a half-life of 2 days, how much of a 16- gram sample will remain after 10 days? A. 4.0 grams B. 2.0 grams C. 1.0 grams D. 0.5 grams If 2.5 grams of a radioactive isotope exist after 30 days in a storage vial, how much was present when it was sealed if the t1/2 = 6 days? A. 80 grams B. 60 grams C. 40 grams...
Assume that a hypothetical radioactive isotope has a half-life of 15 years. A 100.0-mCi sample of this radioactive isotope is deposited in a lead container. How long it will take until the activity of this sample is reduced to 1.00 mCi?
The half-life of a radioactive isotope is 220 d. How many days would it take for the decay rate of a sample of this isotope to fall to 0.47 of its initial rate?