A radioactive material is disintegrating in such a way that after 24 seconds, there is only 20.5% of it left. What is the half-life of the radioactive material? Express your answer in seconds and keep three significant digits. Answer:
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- The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with135 grams of a radioactive isotope, how much will be left after 6 half-lives? Use the calculator provided and round your answer to the nearest gram.When a plant or animal dies, its 14C content decreases with a half-life of t¹/2 = 5730 years. If an archaeologist find an ancient fire-pit containing partially consumed firewood and the 14C content of the wood is 15% of what it would be for a similar carbon sample from a present day tree, what is the approximate age of the ancient site? 24.96.91.88 Enter your numerical result below, in units of years. Aim for a precision of 2 significant figures. Your Answer: AnswerThe radioactive element 2760Co has a half life of ______ years. If you had a sample of 17 g, about how long would it take until you only had 6% left?
- The uranium isotope U-238 has a half-life of about 4.5 × 109 years. i) BOOKWORK Consider 1 mole (238 gm) of isotopically pure uranium U-238. Calculate its activity, and sketch a graph of the activity of the U-238 over the next ten billion years or so. Label the axes with appropriate numbers and units. Mark on the graph the half-life and the characteristic time of decay. ii) UNSEEN The uranium isotope U-238 decays through a chain of fourteen relatively short-lived radionuclides with half-lives of less than one million years before reaching a stable isotope of lead. Bricks, sand, tiles and other building materials typically have an activity of about 50 Bq per kg due to their primordial uranium content, the uranium made in stars and later present in the materials making up our rocks. Estimate the concentration of U-238 in building materials. First consider only the U-238, and then refine your estimate by taking the decay chain into account.Use the graph in the figure below to find the half-life of isotope A. All you need is a sound understanding of the definition of half-life. 40 30 20 10 10 20 30 40 50 Time (days) Need Help? Read It Talk to a Tutor esc DII %23 % 1. 21 4. tab e r t Grams of radionuclideQUESTION 15 Supposed that a radioactive substance has decayed until only of 1/8 of it remains. How many half-lives passed in the process? 2
- If 4 half lives have elapsed for a sample containing a radioactive isotope, and the half life of that isotope is 5 million years, how old is the sample?The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 200 grams of a radioactive isotope, how much will be left after 4 half-lives? Use the calculator provided and round your answer to the nearest gram.A 250g sample of Calcium-47 has a half-life of 4.536 ????. How much Calcuim-47 remains after six half-lives? (ans: 3.91g)
- Question 8 a) Define the half-life of a radioactive material. b) State the relationship between half-life and activity constant.6. The half-life of a radioactive substance is 20 minutes. If we start with 980 g, find the mass after: a) 1 hour b) 10 minutes c) 1 minuteAn isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 30% more of the substance?