Cuesta College, San Luis Obispo, CA
Cf. Giambattista/Richardson/Richardson, Physics, 2/e, Multiple-Choice Question 29.1
Which decay mode decreases the number of neutrons in a nucleus?
(E) (More than one of the above choices.)
(F) (None of the above choices.)
Correct answer (highlight to unhide): (E)
For α decay, a helium nucleus with two protons and two neutrons is emitted from the unstable nucleus; and for β+ decay, a neutron transforms into a proton (either by electron capture, or emitting a positron), which also reduces the number of neutrons in the nucleus.
Exam code: quiz07b3Ta
(A) : 3 students
(B) : 5 students
(C) : 0 students
(D) : 0 students
(E) : 17 students
(F) : 0 students
Success level: 68%
Discrimination index (Aubrecht & Aubrecht, 1983): 0.71