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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Please do e, f and g please
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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