Physics 9702 · AS & A Level · Fundamental particles

Fundamental particles — practice question

Table 7.1 presents incomplete information for three quark flavours (types). The elementary charge is $e$.
(a)[2]

Complete Table 7.1 by adding in the missing charges.

(b(i))[1]

Using the symbols given in Table 7.1, state a possible quark combination for the following hadrons: (i) a neutral baryon.

(b(ii))[1]

Using the symbols given in Table 7.1, state a possible quark combination for the following hadrons: (ii) a meson with a charge of $+e$.

(c(i))[1]

Quarks are fundamental particles. Electrons belong to a different group (class) of fundamental particle. (i) State the name of this group.

(c(ii))[1]

(ii) State the name of another particle belonging to this group.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: Down quark has charge $= -\tfrac{1}{3}e$, charm quark has charge $= +\tfrac{2}{3}e$

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