A-LevelPhysicsParticle physics9702/22 · Feb/Mar 2019 · Q76 Marks
The names of four particles are listed below. alpha beta-plus neutron proton State the name(s) of the particle(s) in this list that:
- (a)The names of four particles are listed below. alpha beta-plus neutron proton State the name(s) of the particle(s) in this list that:
- (a)(i)are not fundamental[1]
- (a)(ii)do not experience an electric force when situated in an electric field[1]
- (a)(iii)has the largest ratio of charge to mass.[1]
- (b)A hadron has a charge of +e where e is the elementary charge. The hadron is composed of only two quarks. One of these quarks is an antidown (d) quark. By considering charge, state and explain the name (flavour) of the other quark.[3]
Mark scheme
Marking points from the official mark scheme (Feb/Mar 2019). The mark or mark type is shown in brackets.
- [1] (a)(i) alpha, neutron and proton
- [1] (a)(ii) neutron
- [1] (a)(iii) beta plus or β⁺
- [1] (b) d has charge (+)⅓ e
- [1] (b) (so) other quark has charge = e - ⅓ e = (+)⅔ e
- [1] (b) other quark is an up / u
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