1. Co-55 is radioactive. Which mode of decay would be expected for this nucleus?
ID: 512963 • Letter: 1
Question
1. Co-55 is radioactive. Which mode of decay would be expected for this nucleus?
A. Positron decay/electron capture
B. Proton decay
C. Beta decay
D. Alpha decay
E. Neutron decay
2. B-8 is radioactive. Which mode of decay would be expected for this nucleus?
A. Positron decay/electron capture
B. Proton decay
C. Beta decay
D. Alpha decay
E. Neutron decay
3. Rb-87 is radioactive. Which mode of decay would be expected for this nucleus?
A. Positron decay/electron capture
B. Proton decay
C. Beta decay
D. Alpha decay
E. Neutron decay
Explanation / Answer
(1) (a) Positron decay or electron capture to get stability.
5527Co ----------> 5526Fe + 0+1e
5527Co + 0-1e ----------> 5526Fe
(2) (D) Alpha decya
85B -----------> 2 42He + 0+1e
(3) (C) Beta decay
8737Rb ----------> 8738Sr + 0-1e
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