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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 decav-constant of sub-

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 decav-constant of sub-

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A sample of material contains 2.00 x 1015 atoms. The sample initially consists entirely of a radioactive sub- 40.12 stance A with a half-life of 1000 s. Atoms of A decay into the stable material B. (a) What is the decay-constant of sub- stance A (in s-1)? S (b) What is the initial activity of sub- stance A (in Bq)? What is the initial activity of sub- (c) 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? (g) What fraction of the initial amount of sample A is still present at each of these times? (h) How many atoms of substance B are there in the sample at each of these times?
Transcribed Image Text:A sample of material contains 2.00 x 1015 atoms. The sample initially consists entirely of a radioactive sub- 40.12 stance A with a half-life of 1000 s. Atoms of A decay into the stable material B. (a) What is the decay-constant of sub- stance A (in s-1)? S (b) What is the initial activity of sub- stance A (in Bq)? What is the initial activity of sub- (c) 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? (g) What fraction of the initial amount of sample A is still present at each of these times? (h) How many atoms of substance B are there in the sample at each of these times?
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