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CAIE A-Level Physics 11.1.9 Neutrinos and Antineutrinos in Beta Decay

Practise selecting electron neutrinos or antineutrinos in beta-plus and beta-minus equations, then completing or interpreting the decay description.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • identify electron antineutrinos in beta-minus decay and electron neutrinos in beta-plus decay
  • use the emitted neutrino or antineutrino to complete or interpret a beta-decay description

11.1.9—That (electron) antineutrinos are produced during β– decay and (electron) question 1

[Maximum number: 1]

Two vertical metal plates are separated by a distance d in a vacuum, as shown in Fig. 7.1.

Fig. 7.1 (not to scale)

Fig. 7.1 (not to scale)

The potential difference (p.d.) between the plates is V. A nucleus with charge +q is initially at rest on plate X . The nucleus is accelerated by the uniform electric field from plate X along a horizontal path to plate Y .

The nucleus is carbon- 14(614C)14\left({ }_{6}^{14} \mathrm{C}\right). This nucleus decays to form a new nucleus by releasing a β−\beta^{-}particle and only one other particle of negligible mass.

State the name of the particle of negligible mass.

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