An isotope of iodine 1311, which has an eight-day half-life, is used in nuclear medicine. A sample of 131| containing 2.00 x 1012 atoms is created in a nuclear reactor. The number of 1311 atoms that remain 36 hours later when the sample is delivered to a hospital is O A 0.99 × 1012 O B. 2.00 x 1012 OC. 1.99 x 1012 O D. 1.76 x 1012

An isotope of iodine 1311, which has an eight-day half-life, is used in nuclear medicine. A sample of 131| containing 2.00 x 1012 atoms is created in a nuclear reactor. The number of 1311 atoms that remain 36 hours later when the sample is delivered to a hospital is O A 0.99 × 1012 O B. 2.00 x 1012 OC. 1.99 x 1012 O D. 1.76 x 1012

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter15: Fluids

Section: Chapter Questions

Problem 1PQ

See similar textbooks

Similar questions

The half-life of phosphorus-32 is about 14days. There are 6.6 grams present initially.a. Express the amount of phosphorus-32 remaining as a function of time t.b. When will there be 1 gram remaining?
Nuclear Physics - Nuclear Structure Density= Nuclear Structure Z mass Volume radius r=r04¹/3 ro=1.2x10-¹5 m N A = Z+N 4 The radius r of a nucleus is given in the above figure. The volume of a nucleus is V = Proton 56 Fe nucleus has a total of 56 nucleons (protons + neutrons). The average mass of a nucleon is u = 1.66x10^-27 kg I whin ber Neutron A Z If this unknown nucleus has 60 neutrons, how many protons does it have? Enter a number rr³ (a)Calculate the radius of a 56 Fe nucleus. Write the radius in fm, 1 fm = 10-15 m. Keep 2 decimal places. Enter a number x10-¹5m, fm (b) Calculate the Denisity of a 56Fe nucleus.. Write the result in terms of 1017 kg/m³. Keep 2 decimal places. Enter a number x10¹7kg/m³ () (c) An unknown hacieus has twice the volume of 56Fe. What is the mass number A of this nucleus? Enter a number i
A certain radioactive material decays exponentially. The percent, P, of the material left after t years is given by P(t) = 100(1.2). a. Determine the half-life of the substance. b. How fast is the substance decaying at the point where the half-life is reached? The substance is decaying at a rate of about -3.8% per year at the time 9.12 years where the half-life is reached The substance is decaying at a rate of about -9.12% per year at the time 6.8 years where the half-life is reached The substance is decaying at a rate of about -9.12% per year at the time 3.8 years where the half-life is reached | None of the above
10.A radioactive material, such as the isotope thorium-234, disintegrates at a rate proportional to the amount currently present. If Q(t) is the amount present at time t, then dQ/dt = −rQ, where r>0 is the decay rate. a.If 100 mg of thorium-234 decays to 82.04 mg in 1 week, determine the decay rate r. b.Find an expression for the amount of thorium-234 present at any time t. c.Find the time required for the thorium-234 to decay to one-half its original amount.
Part A Some atomic masses Particle Symbol Mass (u) Electron e 0.00055 Part B Proton 1.00728 Neutron 1.00866 Part C Hydrogen 1.00783 Helium 4He 4.00260 Part D Part E Part F Calculate the binding energy per nucleon of the helium nucleus He. Express your answer in megaelectron volts to two significant figures. ? MeV
1. The half-life of a radioactive substance is the time it takes for half of the substance to decay. The radioactive iodine isotope I-131, which has a half-life of 8 days, is used to treat hyperthyroidism. Solve 400 - 3.125 to find how many days t it will take for 400 millicuries of I-131 to decay to 3.125 millicuries. A 56 days в 7days C 8 days D 128 days 2. In the year 2000, the population of Mexico was about 100 million, and was growing by approximately 1.53% per year. At this growth rate, the function Ax) = 100(1.0153)* gives the population, in millions, x years after 2000. Using this model and a graph of the function, in what year would the population reach 109 million? Round your answer to the nearest year. 2006 C 2005 D 2007 A в 2008 3. Use a graph to solve 3* - 100. A x-4.2 в х-2.1 C x- 0.2 D x-0.1
Problem A You have a 3 mol pure sample of an unknown material. After 3.7 h, you discover that 20% has decayed. Determine the half-life, decay constant, mean life, & initial decay rate. Also determine what the decay rate is at 3.7 h. T1/2 = λ= 3.28e-04 x h¹ T= R₂ = R= Problem B decays/h decays/h The decay rate of a radioactive source decreases by 32.8% in 92 h. Determine the half-life, decay constant, & mean life of the source. T1/2 = λ = T= h-1
A sample of protactinium-234 of mass 100 g has a half-life of 6.7 hours.A. What fraction of the sample has not decayed after 20.1 hours?B. What is the mass of undecayed protactinium-234 after this period of time?
At the beginning of an experiment, a scientist has 252 grams of radioactive goo. After 195 minutes, her sample has decayed to 3.9375 grams. What is the half-life of the goo in minutes? Find a formula for G(t), the amount of goo remaining at time t. G(t) || How many grams of goo will remain after 32 minutes?
5. A 100 mg sample of radioactive iodine decays to 45 mg after 13 minutes. a. Determine the half-life of the sample, to the nearest hundredth. Then create the half-life equation. How long will it take for the sample to decay to 10 mg? Answer to the nearest tenth of a minute. b.
The number of radioactive nuclei present at the start of an experiment is 3.52 × 10¹5. The number present twenty days later is 5.66 x 10¹4. What is the half-life (in days) of the nuclei? Number i Units
Part A Some atomic masses Particle Symbol Mass (u) Electron e 0.00055 Part B Proton р 1.00728 Neutron n 1.00866 Part C Hydrogen 'H 1.00783 Helium 4He 4.00260 Part D Calculate the mass defect of the helium nucleus He. The mass of neutral He is given by MHe = 4.002603 u. Express your answer in atomic mass units to three significant figures. · View Available Hint(s) ? u