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Question 4 1 pts A particular radioactive isotope has a half-life of 2.90 weeks. What fraction...
3. [4 pts) This question contains 3 parts. A radioactive isotope decays such that 1/8 is left after 8 years. What fraction of the original amount would be left after a total of 16 years? (There is no need to deduce the half-life) 01/16 (ii) 1/24 (iii) 1/32 (iv) 1/64 (v) 1/128 Describe, or show, how you arrived at this answer. If 1/8 was left after 4 years, what would be left after 16 years?
A radioactive sample has a half-life of 10 minutes. What fraction of the sample is left after 40 minutes ? 1/2 1/4 1/8 1/16 Which one is correct ?
Question 1: Radium-223 is a radioactive isotope with a half-life of 11.4 days. How long (in days) will it be before 75% of the sample has decayed? _____days Question 2: 198Au (t1/2 = 2.69 days) is used in the diagnosis of liver problems. What is the rate constant (units in terms of days) of 198Au? What percent of the original 198Au remains after 16.1 days?
V Question 5 3.03 pts Suppose a radioactive isotope has a half-life t% = 99.1 hr. How long will it take for a sample of the isotope to decay to 3.0% of its original activity? a. 218 hr b. 0.0354hr c. 348 yr d. 297 hr e. 501 hr O a Ob Ос Question 6 3.03 pts A radioactive isotope has a half-life, t% = 27.3 yr How long will it take for a 3.27 mCi sample of this isotope...
4. The radioactive isotope 55Fe has a half-life of 2.73 years. (a) What is the rate constant for this first-order reaction? (b)What fraction of the isotope remains after 1 years? Assume 3 significant figures in your calculations
Question 33 5 pts 33. A radioactive element X has the half life of 2 weeks. Calculate the remained amounts of the element X after 18 days if the initial amounts is 18 mg. 7.4 mg 1.8 mg 0,00 mg 12 mg D Question 32 6 pts 32. Determine the element considering the following nuclear reaction: 138 ss Cs ---------- > ?+ 0.se Te Ba Sr Pb
a radioactive material has a half life of 7 days. how many radioactive isotopes are left after 33 hours, if you had 7000000 isotopes in the beginning? Question 33 1 pts A radioactive material has a half life of 7 days. How many radioactive isotopes are left after 33 hours, if you had 7 000 000 isotopes in the beginning? Use 2 sig figs in your answer. < Previous Next >
91. If the half – life of a sample of radioactive material is 60 days, what fraction of the original radioactive nuclei will remain after 120 days.
Radioactive gold-198 is used in the diagnosis of liver problems. The half-life of this isotope is 2.7 days. If you begin with a sample of 9.4 mg of the isotope, how much of this sample remains after 2.4 days?
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.