Chapter 42

1. Chapter 42

2. Three electrons orbit a neutral 6Li atom. How many electrons orbit a neutral 7Li atom? 1. 1 2. 2 3. 3 4. 4 5. 5

3. Three electrons orbit a neutral 6Li atom. How many electrons orbit a neutral 7Li atom? 1. 1 2. 2 3. 3 4. 4 5. 5

4. The isobars corresponding to one specific value of A are found on the plot to the right along 1. A vertical line. 2. A horizontal line. 3. A diagonal line that goes up and to the right. 4. A diagonal line that goes up and to the left.

5. The isobars corresponding to one specific value of A are found on the plot to the right along 1. A vertical line. 2. A horizontal line. 3. A diagonal line that goes up and to the right. 4. A diagonal line that goes up and to the left.

6. A very bright spotlight shines on a Geiger counter. Does it click? 1. Yes 2. No

7. A very bright spotlight shines on a Geiger counter. Does it click? 1. Yes 2. No

8. A sample starts with 1000 radioactive atoms. How many half-lives have elapsed when 750 atoms have decayed? 1. 0.25 2. 0.75 3. 1.5 4. 2.0 5. 2.5

9. A sample starts with 1000 radioactive atoms. How many half-lives have elapsed when 750 atoms have decayed? 1. 0.25 2. 0.75 3. 1.5 4. 2.0 5. 2.5

10. The cobalt isotope 60Co (Z = 27) decays to the nickel isotope 60Ni (Z = 28). The decay process is 1. Alpha decay. 2. Beta-plus decay. 3. Beta-minus decay. 4. Electron capture. 5. Gamma decay.

11. The cobalt isotope 60Co (Z = 27) decays to the nickel isotope 60Ni (Z = 28). The decay process is 1. Alpha decay. 2. Beta-plus decay. 3. Beta-minus decay. 4. Electron capture. 5. Gamma decay.

12. Chapter 42 Reading Quiz

13. Protons and neutrons together are referred to as 1. Nuclei. 2. Neutrinos. 3. Nucleons. 4. Mesons. 5. Leptons.

14. Protons and neutrons together are referred to as 1. Nuclei. 2. Neutrinos. 3. Nucleons. 4. Mesons. 5. Leptons.

15. How many kinds of ionization radiation are there? 1. One 2. Two 3. Three 4. Four 5. Five

16. How many kinds of ionization radiation are there? 1. One 2. Two 3. Three 4. Four 5. Five

17. 50% of the nuclei in a radioactive sample decay in one half life. What percent decay in two half lives? 1. 100% 2. 75% 3. 50% 4. 25%

18. 50% of the nuclei in a radioactive sample decay in one half life. What percent decay in two half lives? 1. 100% 2. 75% 3. 50% 4. 25%

19. The nuclear density 1. increases as the nuclear radius increases. 2. decreases as the nuclear radius increases. 3. stays roughly constant as the nuclear radius increases. 4. Depends on the ratio of neutrons to protons.

20. The nuclear density 1. increases as the nuclear radius increases. 2. decreases as the nuclear radius increases. 3. stays roughly constant as the nuclear radius increases. 4. Depends on the ratio of neutrons to protons.

21. The strong force is an attractive force between 1. two protons. 2. two neutrons. 3. a proton and a neutron. 4. an electron and a neutron. 5. all of 1–4.

22. The strong force is an attractive force between 1. two protons. 2. two neutrons. 3. a proton and a neutron. 4. an electron and a neutron. 5. all of 1–4.

23. The line of stability shows that, in general, stable nuclei have 1. more neutrons than protons. 2. more protons than neutrons. 3. roughly equal numbers of protons and neutrons. 4. more protons than electrons. 5. more neutrons than electrons.

24. The line of stability shows that, in general, stable nuclei have 1. more neutrons than protons. 2. more protons than neutrons. 3. roughly equal numbers of protons and neutrons. 4. more protons than electrons. 5. more neutrons than electrons.