A-LevelPhysicsParticle physics9702/22 · Oct/Nov 2018 · Q86 Marks
(a) In the following list, underline all particles that are leptons. antineutrino positron proton quark (b) A stationary nucleus of magnesium-27, ²⁷₁₂Mg, decays by emitting a β⁻ particle and γ radiation. An incomplete equation to represent this decay is ²⁷₁₂Mg → X + β⁻ + γ.
- (a)In the following list, underline all particles that are leptons. antineutrino positron proton quark[1]
- (b)(i)State the nucleon number and the proton number of nucleus X. nucleon number = proton number =[2]
- (b)(ii)State the name of the interaction that gives rise to this decay.[1]
- (b)(iii)State two possible reasons why the sum of the kinetic energy of the β⁻ particle and the energy of the γ radiation is less than the total energy released during the decay of the magnesium nucleus. 1. 2.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.
- [B1] antineutrino and positron both underlined (and no other particles)
- [A1] nucleon number = 27
- [A1] proton number = 13
- [B1] weak (nuclear force/interaction)
- [B1] an (electron) antineutrino / v̅e is produced (and this has energy)
- [B1] X has kinetic energy
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