1) An alpha particle is also known as a) an electron. b) a positron. c) a helium nucleus. d) a photon. 2) A beta particle is also known as a) an electron. b) a positron. c) a helium nucleus. d) a photon. 3) What is the number of neutrons in this isotope of uranium? a) 92 b) 119 c) 146 d) 238 4) Which statement describes nuclear fusion? a) Two hydrogen nuclei join to form a helium nucleus. b) A helium nucleus joins with a hydrogen nucleus to form an alpha particle. c) Uranium nuclei split and produce high energy neutrons causing a chain reaction. d) Two helium nuclei join to form a hydrogen nucleus. 5) The existence of the neutrino was postulated in order to explain a) alpha decay. b) gamma emission. c) beta decay. d) fission. 6) When an alpha particle is emitted from an unstable nucleus, the atomic mass number a) increases by 2. b) decreases by 2. c) increases by 4. d) decreases by 4. e) none of the above. 7) A positron has a mass number of _____, a charge of _____, and a mass equal to that of a(an) _____. a) 0, 1+, proton b) 1, 2+, proton c) 0, 1+, electron d) 1, 2+, electron e) 0, 0, proton 8) Which of the following describes what occurs in the fission process? a) A heavy nucleus is fragmented into lighter ones. b) A neutron is split into a neutron and proton. c) Two light nuclei are combined into a heavier one. d) A proton is split into three quarks. e) A particle and anti-particle appear in an area of high energy density. 9) Which of the following statements about nuclear fission is always correct? a) Very little energy is released in fission processes. b) Nuclear fission is an energetically favourable process for heavy atoms. c) Due to its instability, 56Fe readily undergoes fission. d) In fission reactions, a neutron is split into a proton and an electron. e) All nuclear fission reactions are spontaneous. 10) Which type of radiation is the least penetrating? a) alpha. b) beta. c) gamma. d) x-ray. e) neutron.

Radioactive decay

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