Cuesta College, San Luis Obispo, CA
This Feynman diagram vertex depicts a neutron:
(A) converting into a proton.
(B) converting into an antiproton.
(C) annihilating with a proton.
(D) annihilating with an antiproton.
(E) (this vertex is not possible, as it is invalid.)
Correct answer (highlight to unhide): (A)
This Feynman diagram vertex is valid, as it obeys the four rules of drawing Feynman diagrams, especially the first two:
- You can draw two kinds of lines, a straight line with an arrow or a wiggly line [here, a dashed line]. You can draw these pointing in any direction.
- You may only connect these lines if you have two lines with arrows meeting a single wiggly [dashed] line. Note that the orientation of the arrows is important! You must have exactly one arrow going into the vertex and exactly one arrow coming out.
--Phillip "Flip" Tanedo, "Let's Draw Feynman Diagrams," Cornell University/USLHC Collaboration
Sections 30882, 30883
Exam code: quiz07bC4n
(A) : 34 students
(B) : 0 students
(C) : 1 student
(D) : 1 student
(E) : 2 students
Success level: 89%
Discrimination index (Aubrecht & Aubrecht, 1983): 0.20