33 1 33 2 33 3 33 4

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Isotopes hydrogen deuterium tritium Nuclear strong force 33. 7

Electrostatic repulsion Radioactive Decay 33. 8

Bubble Chamber 33. 9

Uranium Decay 33. 10

C 14 Dating 33. 11

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-- Questions -MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 33. 13

1) Most of the radioactivity we personally encounter comes from A) nuclear power plants. B) medical X rays. C) the natural environment. D) fallout from past and present testing of nuclear weapons. 2) In order for an atom to decay to an element which is one greater in atomic number, it can emit A) one beta particle. B) one positron and 2 beta particles. C) one alpha particle and 3 beta particles. D) all of these. E) none of these. 33. 14

3) When a beta particle is ejected from a nucleus, the nucleus then has a greater A) charge. B) mass. C) both of these. D) neither of these. 4) Carbon dating requires that the object being tested contain A) organic material. B) sugar molecules. C) charcoal. D) inorganic material. E) none of these. 33. 15

5) Electric forces within an atomic nucleus tend to A) push it apart. B) hold it together. C) neither of these. 6) The end result of radioactive decay can be a different A) atom. B) element. C) isotope. D) all of these. E) none of these. 33. 16

7) The atomic mass number of an element is the same as the number of its A) neutrons. B) nucleons. C) protons. D) none of these. 8) It's impossible for a hydrogen atom to emit an alpha particle. A) False. B) True. 33. 17

9) In bubble chambers, charged particles move in spirals because A) the magnetic field decreases. B) of perspective and parallax. C) of energy dissipation. D) the electric charge decreases. E) the electric charge increases. 10) The half life of carbon 14 is 5730 years. If a 1 -gram sample of old carbon is 1/8 as radioactive as 1 -gram of a current sample, then the age of the old sample is about A) 716 years. B) 11, 500 years. C) 17, 200 years. D) 22, 900 years. E) 46, 000 years. 33. 18

11) When the hydrogen isotope tritium-3 emits a beta particle, it becomes an isotope of A) lithium. B) carbon. C) helium. D) hydrogen. E) none of these. 12) All deposits of natural uranium contain appreciable amounts of A) gold. B) iron. C) lead. D) all of these. E) none of these particularly. 33. 19

13) A quark is A) a building block of nucleons. B) a building block of hadrons. C) an elementary particle. D) all of these. E) none of these. 14) When a beta particle is ejected from a nucleus, the nucleus then has slightly A) smaller charge and significantly greater mass. B) greater mass and smaller charge. C) smaller mass and significantly greater charge. D) greater mass and charge. 33. 20

15) A certain radioactive isotope placed near a Geiger counter registers 120 counts per minute. If the half life of the isotope is one day, what will the count rate be at the end of four days? A) 30 counts/min B) 15 counts/min C) 10 counts/min D) 7. 5 counts/min E) 5 counts/min 16) The mass of an atomic nucleon is nearly A) twice the mass of an electron. B) four times the mass of an electron. C) a thousand times the mass of an electron. D) two thousand times the mass of an electron. 33. 21

-- Answers -MULTIPLE CHOICE. The one alternative that best completes the statement or answers the question. 33. 22

Chapter 33 1) Answer: C 2) Answer: D 3) Answer: A 4) Answer: A 5) Answer: A 6) Answer: D 7) Answer: B 8) Answer: B 9) Answer: C 10) Answer: C 11) Answer: C 12) Answer: C 13) Answer: D 14) Answer: C, D 15) Answer: D 16) Answer: D 33. 23