What particle is emitted when 240Pu decays to 236U? (atomic numbers of Pu and U are, respectively, 94 and 92)
a. alpha
b. beta (electron)
c. beta (positron)
d. gamma quantum
[Ques. 2] What particle is emitted when 20Na decays to 20Ne? (atomic numbers of Na and Ne are, respectively, 11 and 10)
a. alpha
b. beta (electron)
c. beta (positron)
d. gamma quantum
[Ques. 3] A radioactive isotope that emits an alpha particle will change in what respect?
a. Atomic number decreases by four.
b. Mass number decreases by four.
c. Both choices a and b are valid.
d. None of the above choices are valid.
[Ques. 4] A radioactive isotope that emits a gamma quantum will change in what respect?
a. Atomic number increases by one.
b. Atomic number decreases by one.
c. Atomic mass number decreases by one.
d. None of the above choices are valid.
[Ques. 5] The existence of the neutrino was postulated to account for which basic conservation laws during the beta decay process?
a. conservation of energy
b. conservation of momentum
c. Both choices a and b are valid.
d. None of the above choices are valid.
[Ques. 6] The alpha emission process results in the daughter nucleus differing in what manner from the parent?
a. Atomic mass increases by one.
b. Atomic number decreases by two.
c. Atomic number increases by one.
d. Atomic mass decreases by two.
[Ques. 7] The beta emission process results in the daughter nucleus differing in what manner from the parent?
a. Atomic mass changes by one.
b. Atomic number changes by two.
c. Atomic number changes by one.
d. Atomic mass changes by two.
[Ques. 8] Of the main types of radiation emitted from naturally radioactive isotopes, which of the following is the most penetrating?
a. alpha
b. beta (electron)
c. gamma
d. beta (positron)
[Ques. 9] Chromium-55 (54.940 8 u) emits an electron leaving a daughter nucleus of manganese-55 (54.938 0 u). How much energy is released in this reaction? (1 u = 931.5 MeV/c2)
a. 5.59 MeV
b. 2.61 MeV
c. 1.40 MeV
d. 0.70 MeV
[Ques. 10] When radium-224 emits an alpha particle, the remaining daughter nucleus is which of the following?
a. lead-213
b. actinium-215
c. radon-220
d. bismuth-215
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