A sample of material contains 2.00 x 1015 atoms. The sample initially consists entirely of a radioactive sub- stance A with a half-life of 1000 s. Atoms of A decay into the stable material B. 40.12 (a) What is the decay-constant of sub- stance A (in s-l)? (b) What is the initial activity of sub- stance A (in Bq)? (c) What is the initial activity of sub- stance A (in Ci)? The activity of the sample and the amount of substances A and B are recorded at the following times: (i) 1000 s (ii) 2000 s (iii) 3000 s (iv) 4000 s Use this information to answer the fol- lowing questions: (d) What is the activity of the sample at each of these times (in Ci)? (e) What is the activity of the sample at each of these times in terms of its initial activity? (f) How many atoms of substance A are there in the sample at each of these times?

A sample of material contains 2.00 x 1015 atoms. The sample initially consists entirely of a radioactive sub- stance A with a half-life of 1000 s. Atoms of A decay into the stable material B. 40.12 (a) What is the decay-constant of sub- stance A (in s-l)? (b) What is the initial activity of sub- stance A (in Bq)? (c) What is the initial activity of sub- stance A (in Ci)? The activity of the sample and the amount of substances A and B are recorded at the following times: (i) 1000 s (ii) 2000 s (iii) 3000 s (iv) 4000 s Use this information to answer the fol- lowing questions: (d) What is the activity of the sample at each of these times (in Ci)? (e) What is the activity of the sample at each of these times in terms of its initial activity? (f) How many atoms of substance A are there in the sample at each of these times?

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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