1. A nucleus of neon-20 has 10 protons and 10 neutrons. A nucleus of terbium-160 has 65 protons and 95 neutrons. Compared to the radius of a neon-20 nucleus, the radius of a terbium-160 nucleus is Q43.1 1. 9.5 times larger 2. 8 times larger 3. 6.5 times larger 4. 4 times larger 5. 2 times larger

2. A nucleus of neon-20 has 10 protons and 10 neutrons. A nucleus of terbium-160 has 65 protons and 95 neutrons. Compared to the radius of a neon-20 nucleus, the radius of a terbium-160 nucleus is A43.1 1. 9.5 times larger 2. 8 times larger 3. 6.5 times larger 4. 4 times larger 5. 2 times larger

3. Why do stable nuclei with many nucleons (those with a large value of A) have more neutrons than protons? Q43.2 1. an individual nucleon interacts via the nuclear force with only a few of its neighboring nucleons 2. the electric force between protons acts over long distances 3. the nuclear force favors pairing of both neutrons and protons 4. both 1. and 2. 5. all of 1., 2., and 3.

4. Why do stable nuclei with many nucleons (those with a large value of A) have more neutrons than protons? A43.2 1. an individual nucleon interacts via the nuclear force with only a few of its neighboring nucleons 2. the electric force between protons acts over long distances 3. the nuclear force favors pairing of both neutrons and protons 4. both 1. and 2. 5. all of 1., 2., and 3.

5. What kind of unstable nuclei typically decay by emitting an alpha particle? Q43.3 1. those with too many neutrons 2. those with too many protons 3. those with too many neutrons and too many protons 4. misleading question — the numbers of neutrons and protons in a nucleus are unrelated to whether or not it emits an alpha particle

6. What kind of unstable nuclei typically decay by emitting an alpha particle? A43.3 1. those with too many neutrons 2. those with too many protons 3. those with too many neutrons and too many protons 4. misleading question — the numbers of neutrons and protons in a nucleus are unrelated to whether or not it emits an alpha particle

7. What kind of unstable nuclei typically decay by emitting a gamma-ray photon? Q43.4 1. those with too many neutrons 2. those with too many protons 3. those with too many neutrons and too many protons 4. misleading question — the numbers of neutrons and protons in a nucleus are unrelated to whether or not it emits gamma rays

8. What kind of unstable nuclei typically decay by emitting a gamma-ray photon? A43.4 1. those with too many neutrons 2. those with too many protons 3. those with too many neutrons and too many protons 4. misleading question — the numbers of neutrons and protons in a nucleus are unrelated to whether or not it emits gamma rays

9. As a sample of radioactive material decays, the decay rate Q43.5 1. is directly proportional to the half-life and directly proportional to the number of radioactive nuclei remaining 2. is directly proportional to the half-life and inversely proportional to the number of radioactive nuclei remaining 3. is inversely proportional to the half-life and directly proportional to the number of radioactive nuclei remaining 4. is inversely proportional to the half-life and inversely proportional to the number of radioactive nuclei remaining

10. As a sample of radioactive material decays, the decay rate A43.5 1. is directly proportional to the half-life and directly proportional to the number of radioactive nuclei remaining 2. is directly proportional to the half-life and inversely proportional to the number of radioactive nuclei remaining 3. is inversely proportional to the half-life and directly proportional to the number of radioactive nuclei remaining 4. is inversely proportional to the half-life and inversely proportional to the number of radioactive nuclei remaining

11. Why does nuclear fusion of hydrogen require high temperatures? Q43.6 1. positive charges repel each other 2. the nuclear force only acts at short range 3. both 1. and 2. 4. neither 1. nor 2.

12. Why does nuclear fusion of hydrogen require high temperatures? A43.6 1. positive charges repel each other 2. the nuclear force only acts at short range 3. both 1. and 2. 4. neither 1. nor 2.