How many half-lives must elapse until (a) 77% and (b) 99% of a radioactive sample of atoms has decayed?Part AExpress your answer using two significant figures.ΜΕ ΑΣΦSubmitRequest AnswerPart BExpress your answer using two significant figures.ΕΕ ΑΣΦ??

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College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter30: Nuclear Energy And Elementary Particles

Section: Chapter Questions

Problem 12P

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How many half-lives must elapse until (a) 77% and (b) 99
% of a radioactive sample of atoms has decayed?
Part A
Express your answer using two significant figures.
ΜΕ ΑΣΦ
Submit
Request Answer
Part B
Express your answer using two significant figures.
ΕΕ ΑΣΦ
?
?

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RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: 1 Ci = 3.7 × 1010 Bq 1. Nuclear decay law: N = Noe¬at, The law of radioactive decay gives the quantitative relationship between the original number of nuclei present at time zero No and the number N at a later time t (sec), where e = 2.71828... is the base of the natural logarithm, and 2 is the decay constant for the nuclide (1/s). 2. Relationship between decay constant 1 and isotop half-life T1/2: 0.693 T1/2 1= In(2) Half-life Modality Radioisotope T1/2 where a is decay constant (1/s), T1/2 is isotope half- life (s). Carbon-11 20 minutes PET Fluorine-18 110 minutes PET Copper-64 | 12.7 hours PET 3. Activity or decay rate of a radioactive source A: Gallium-67 AN A = At where A is activity or decay rate of a radioactive lodine-123 source (Bq), N is number of nuclei present at time t Thallium-201 (s ), 2 is decay constant (1/s). 78.3 hours SPECT | 68 minutes Gallium-68 Technetum-99m PET 6.02 hours SPECT Indium-111 | 67.3 hours SPECT…
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How many half-lives must elapse until (a) 77% and (b) 99 % of a radioactive sample of atoms has decayed? Part A Express your answer using two significant figures. ΜΕ ΑΣΦ Submit Request Answer Part B Express your answer using two significant figures. ΕΕ ΑΣΦ ? ?