The radioactive isotope Cs-137 has a half-life of 30 years. Starting with 1.0 mg of Cs, how much would remain after 90 years?
The radioactive isotope Cs-137 has a half-life of 30 years. Starting with 1.0 mg of Cs,...
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 14. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.500 15. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 16. A 2.5 gram sample of an...
Strontium-90 has a half-life of 28.1 years. Starting with 3.2 mg of this isotope, how much would remain after 112.4 years?
Cesium-137 has a half-life of 30 years. If you start with 1.0 g of 137Cs, how much 137Cs will be remaining after 60 years? O 0.30 g O 0.50 g O 0.90 g O 0.00 g O 0.25 g SUBMIT
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.
If a container of radioactive isotope has a half-life of 10 years, how many years will it take for there to only be 25% of the isotope remaining in the container.
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.
The radioactive isotope thorium 234 has a half-life of approximately 578 hours. (a) If a sample has a mass of 67 milligrams, find an expression for the mass after t hours. Q(t) = 67e-0.0011997 (b) How much will remain after 85 hours? (Round your answer to one decimal place.) 60.5 mg (c) When will the initial mass decay to 20 milligrams? (Round your answer to one decimal place.) 1008.3 x hr
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?
14C is a radioactive isotope with a half life of 5.73x10^3 years. Radioactive decay is first order process and the amount of 14C present in an object can be used to determine its age. How long does it take for for 90 % of the 14C in a sample to decompose?
Cesium-137, used in cancer treatment, has a half- life of 30 years. are here 1974 used in cancer treatment, has a half- Part A Enter the balanced nuclear equation for the beta decay (e) of cesium-137 Express your answer as a nuclear equation. Α. ΑΣφ on? Subrnit Previous Answers Request Answer Part B How many milligrams of a 24 mg sample of cesium-137 remain after 120 years? Express the mass to two significant figures and include the appropriate units. Value...