1) If the activity of a purely radioactive sample of 55Fe measured to be 0.5 mCi. What is the number of nuclei of this isotope present after 5.4 years. 2) 226Ra (t1/2 = 1600 y) alpha decays to the 1st excited state of nucleus X with branching ratio 6% and alpha decays to the ground state of X with branching ratio 94%. Calculate the partial half-life for the first mode transition (the one to the first excited state of X). 3) Fill the missing and decide the type of decay in the following decays: a) Co* ] + Co b) ¹50 →>>> [ ] + [ ] + ¹5N c) 19K + [ ]→ 18Ar ->> 210 d) 24 Po e) ¹3 Be a + [ ] 12Be + [ ]
1) If the activity of a purely radioactive sample of 55Fe measured to be 0.5 mCi. What is the number of nuclei of this isotope present after 5.4 years. 2) 226Ra (t1/2 = 1600 y) alpha decays to the 1st excited state of nucleus X with branching ratio 6% and alpha decays to the ground state of X with branching ratio 94%. Calculate the partial half-life for the first mode transition (the one to the first excited state of X). 3) Fill the missing and decide the type of decay in the following decays: a) Co* ] + Co b) ¹50 →>>> [ ] + [ ] + ¹5N c) 19K + [ ]→ 18Ar ->> 210 d) 24 Po e) ¹3 Be a + [ ] 12Be + [ ]
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter25: Nuclear Chemistry
Section25.4: Rates Of Nuclear Decay
Problem 25.5CYU
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please solve question 2
![1) If the activity of a purely radioactive sample of 55Fe is measured to
be 0.5 mCi. What is the number of nuclei of this isotope present
after 5.4 years.
2) 226Ra (t₁/2 = 1600 y) alpha decays to the 1st excited state of nucleus X
with branching ratio 6% and alpha decays to the ground state of X
with branching ratio 94%. Calculate the partial half-life for the first
mode transition (the one to the first excited state of X).
3) Fill the missing and decide the type of decay in the following
decays:
a)
Co* → [ ] +
Co
b) ¹50 [ ] + [
] + ¹5N
40
c) 10K + [ ] 18Ar
d) 21 Po
84
e) ¹3 Be →>>
2a + [ ]
¹2Be + [ ]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcaaf7cef-e6e4-4294-899c-b56e27435a55%2F008a0fc3-9b92-49ce-85e9-fec28a76af3a%2Fz13tbfs_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1) If the activity of a purely radioactive sample of 55Fe is measured to
be 0.5 mCi. What is the number of nuclei of this isotope present
after 5.4 years.
2) 226Ra (t₁/2 = 1600 y) alpha decays to the 1st excited state of nucleus X
with branching ratio 6% and alpha decays to the ground state of X
with branching ratio 94%. Calculate the partial half-life for the first
mode transition (the one to the first excited state of X).
3) Fill the missing and decide the type of decay in the following
decays:
a)
Co* → [ ] +
Co
b) ¹50 [ ] + [
] + ¹5N
40
c) 10K + [ ] 18Ar
d) 21 Po
84
e) ¹3 Be →>>
2a + [ ]
¹2Be + [ ]
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