A-LevelPhysicsParticle physics9702/22 · May/June 2017 · Q83 Marks
Describe two differences between the decay of a nucleus that emits a β⁻ particle and the decay of a nucleus that emits a β⁺ particle.
- (a)Describe two differences between the decay of a nucleus that emits a β⁻ particle and the decay of a nucleus that emits a β⁺ particle.[2]
- (b)In a simple quark model there are three types of quark. State the composition of the proton and of the neutron in terms of these three quarks.[1]
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [B1] β⁻ emission: neutron changes to proton (+ beta⁻/electron) and β⁺ emission: proton changes to neutron (+ beta⁺/positron)
- [B1] β⁻ emission: (electron) antineutrino also emitted and β⁺ emission: (electron) neutrino also emitted
- [B1] proton: up up down (and zero strange) neutron: up down down (and zero strange)
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →