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Chapter 42: Q 23 Exercise (page 1236)
The half-life of 60Co is 5.27 years. The activity of a 60Co
sample is 3.50 x 109 Bq. What is the mass of the sample?
Hence the mass of the sample is :
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What is the half-life in days of a radioactive sample with 5.0 x 1015
atoms and an activity of 5.0 x 108 Bq?
Calculate the chemical atomic mass of silicon.
Beta-plus decay is
a. Determine the mass threshold for beta-plus decay. That is, what is the minimum atomic mass mX for which this decay is energetically possible? Your answer will be in terms of the atomic mass mY and the electron mass me.
b. Can 13 N undergo beta-plus decay into 13 C? If so, how much energy is released in the decay?
Use data in Appendix to make your own chart of stable and unstable nuclei, similar to Figure , for all nuclei with .Use a blue or black dot to represent stable isotopes, a red dot to represent isotopes that undergo beta-minus decay, and a green dot to represent isotopes that undergo beta-plus decay or electron-capture decay.
The element gallium has two stable isotopes: 69 Ga with an atomic mass of 68.92 u and 71 Ga with an atomic mass of 70.92 u. A periodic table shows that the chemical atomic mass of gallium is 69.72 u. What is the percent abundance of 69 Ga?
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