A sample of radioactive technetium-99 of half-life 6 h is to be used in a clinical examination. The sample is delayed 18 h before arriving at the lab for use. Part A Determine the fraction of radioactive technetium that remains. Express your answer numerically. IVE ΑΣΦ ? N = No 0.18
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- Question A8 Sketch a diagram indicating the s-process path from 131 Xe to 140 Ce. Specify the type of each process (i.e. neutron capture, electron capture, beta decays) in the path.What is the activity of a sample of C that contains 5.3x1020 nuclei? The half-life of C is 5700 years. Express your answer using two significant figures. ? ΔΝ decays/s AtConstants I Periodic Table (Figure 1) is the graph of binding energy per nuclon. Part A Use the graph to estimate the total energy released if a nucleus with mass number 240 fissions into two nuclei with mass number 120. Express your answer in mega-electron volts to one significant figure. ΑΣφ ? E = MeV Submit Request Answer Figure 1 of 1 Provide Feedback Next > Binding energy (MeV) per nucleon 10- Maximum 8.8 MeV per nucleon 9 8 7 6 5 4 3 1 50 100 150 200 250 Mass number, A
- C Exercise 29.23 Part A Calculate the time required for a sample of radioactive tritium to lose 79.0 % of its activity. (Tritium has a half-life of 12.3 years.) V t = 28.6 Submit ΑΣΦ Provide Feedback Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining Review your calculations and make sure you round to 3 significant figures in the last step. H ? Q Search years P Pearson W5. 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.Question 04 The moderator temperature coefficient for a reactor is -8.2 pcm/ F. Calculate the reactivity defect that results from a temperature decrease of 5° F. Px = (Ax)(ax)
- Problem A You have a 5.7 mol pure sample of an unknown material. After 2 h, you discover that 44% has decayed. Determine the half-life, decay constant, mean life, & initial decay rate. Also determine what the decay rate is at 2 h. T1/2= λ = T= Ro= R= h-1 decays/h decays/hLearning Goal: Radioactive decay - Half-life N 1,000,000 500,000 250,000 125,000 62,500 Number of nuclides, N x 10³ 1000 750 500 250 125 0 Time 0 the 2012 3h2 4112 5h2 612 7h2 8h2 9412 10₁2 31,250 15,625 he 2h 3h 4h 5h 6h 7he 8he 9h 10h Time in multiples of f 7,813 3,906 1,953 977 A radioactive sample's half-life is 30.2 years. 1 year = 365 days, 1 day = 24 hours, 1 hour = 60 min, 1 min = 60 sThe number of radioactive nuclei present at the start of an experiment is 4.80 × 10¹5. The number present twenty days later is 6.34 × 10¹4. What is the half-life (in days) of the nuclei? Number i Units