Physics 9702 · AS & A Level · Atoms, nuclei and radiation
Atoms, nuclei and radiation — practice question
Fig. 7.1 shows a graph with nucleon number $A$ on the horizontal axis and proton number $Z$ on the vertical axis. A cross labelled P marks nucleus P. Nucleus P then undergoes decay by emitting an $\alpha$ particle, which produces nucleus Q. Nucleus Q then undergoes decay by emitting a $\beta^{-}$ particle, which produces nucleus R.
(a(i))[1]
Use a cross on Fig. 7.1 to show nucleus Q, and label that cross Q.
(a(ii))[1]
Use a cross on Fig. 7.1 to show nucleus R, and label that cross R.
(b)[1]
State the name of the particle class (group) that contains the $\beta^{-}$ particle.
(c)[1]
Describe how the quark composition of one nucleon in Q changes during the emission of the $\beta^{-}$ particle.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Q shown at $(82,210)$” …