Question

9. 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.

10. 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.

11. 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.

12. 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

Answer 1

a) c) Both choices a and bare valid There is a strict limit on the energy of the ē from each type of beta decay such a limit is not expected if conservation of energy is invalid. Energy and momentum seemed not to be conserved ich one assumed neutron decays only to proton & es. 10) D None of the above choices are valid V ray does not change mass number of atomic number. It will decrease the energy of the atom ... 1) b) Mass number decreases by form 4He is emitted which will accruce the mass number by four. 12 0 beta (positson). 20 Na zone +b+tv