試題詳解

39. Which of the following statements about nuclear reaction and stability are TRUE?
(A) A radioactive nuclide that decays from atoms to 2.5 x 10⁹ atoms in 10.0 mins has a half-life of 5.0 mins.
(B) Nuclides with large Z values are often observed to be a-particle producers.
(C) As Z increases, , nuclides need a greater proton-to-neutron ratio for stability.
(D) Those "light" nuclides that have twice as many neutrons as protons are expected to be stable.
(E) If more than one neutron from each fission event causes another fission event, the fission situation is described as supercritical.