A sample contains radioactive atoms of two types, A andB. Initially there are five times as many A atoms as thereare B atoms. Two hours later, the numbers of the twoatoms are equal. The half-life of A is 0.67 hours.Part AWhat is the half-life of B?Express your answer using two significant figures.Η ΜΕ ΑΣΦ(t1/2)B =SubmitRequest Answer?hours

To solve for the half-life of type B atoms, we start by defining the initial quantities and using…

Answered: A sample contains radioactive atoms of…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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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.
You are provided with a sample of pure Osmium-186 (186Os), a radioactive nuclide. a. How many neutrons are there in a single nucleus of Osmium-186? b. Give the symbol for the most common naturally occurring isotope for Osmium. c. Give the symbols for two isotones for Osmium-186. d. Determine the binding energy of a single Osmium-186 nucleus in units of MeV.
5. Krypton-85 is an inert radioactive noble gas with a half-life of approximately 10.76 years. a. Write an exponential function to model this situation and define each variable. ( b. Determine what fraction of a sample of Krypton-85 will remain after 86.08 years. State the answer as an exact fraction value. ( C. Determine how long will it take for a sample of Krypton-85 to decay to 1/64 of its original mass. Round your answer to the nearest hundredth of a year.
The barium isotope 131 Ba has a half-life of 12 days. A 210 µg sample of 131 Ba is prepared. Part A What is the mass of 131 Ba after 1 day? Express your answer to two significant figures and include the appropriate units. μΑ ? Value mug m =
Radon gas has a half-life of 3.83 days. If 2.92 g of radon gas is present at time t = 0, what mass of radon will remain after 2.20 days have passed? g
The age of wine can be determined by measuring its radioactive tritium content. i. How many protons, electrons, and neutrons are in tritium (3H)? ii. The half life of tritium is 12.5 years. What is the age of a wine that has only 43% of the tritium activity of a freshly bottled sample? Please explain why your answer makes sense.
Answer the following questions regarding the radioactive isotope radium-226. A.Write a nuclear equation for when this nucleus undergoes beta decay. B.What is the binding energy of a radium-226 nucleus? The mass of radium-226 is 226.02541 amu. C.A rock obtained by geologists was found to obtain 1.38 mg of radium-226. Later studies confirmed that 922 years prior, the rock contained 34.6 mg of radium-226. How many half-lives have elapsed? D.Based on your answer to Question C, determine the half-life of radium-226. E.Based on your answers to Questions C & D, determine the rate constant of the beta decay of radium-226
5. Krypton-85 is an inert radioactive noble gas with a half-life of approximately 10.76 years. a. Write an exponential function to model this situation and define each variable. ( b. Determine what fraction of a sample of Krypton-85 will remain after 86.08 years. State the answer as an exact fraction value. ( C. Determine how long will it take for a sample of Krypton-85 to decay to 1/64 of its original mass. Round your answer to the nearest hundredth of a year.
5. Krypton-85 is an inert radioactive noble gas with a half-life of approximately 10.76 years. a. Write an exponential function to model this situation and define each variable. ( b. Determine what fraction of a sample of Krypton-85 will remain after 86.08 years. State the answer as an exact fraction value. ( C. Determine how long will it take for a sample of Krypton-85 to decay to 1/64 of its original mass. Round your answer to the nearest hundredth of a year.
You are experimenting with a radioactive sample of polonium. At the end of 14.0 minutes, exactly 1/16 of the polonium remains. Part A Approximately how much more time you will need to wait until less than 0.1% of the original polonium sample remains? 21 minutes 1 hour and 10 mins 3 hours and 30 mins 35 minutes Submit Request Answer
A radioactive sample has a half-life of 1.0 min. That is, each nucleus has a 50% of undergoing a decay sometime between t = 0 and t = 1 min. One particular nucleus has not decayed at t = 15 min. Part A What is the probability that this nucleus will decay sometime between t = 15 min and t = 16 min? Express your answer using two significant figures. ΤΟ ΑΣΦ ? %
1. A radioactive substance with an initial mass of 250 mg has a half-life of 1 year. a) Write an equation to relate the mass of radioactive material remaining to time b) What mass will remain after 10 years? c) How long will it take the initial sample to decay to 20% of its initial mass? (Please show how you arrived at your answer by showing all of your calculations.)

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