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CAIE A-Level Physics AS 11.1.9 That Electron Antineutrinos Are Produced During Decay and Electron Questions

Identify the neutrino or antineutrino emitted in beta-minus and beta-plus decay and use lepton conservation to complete equations.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Identify neutrinos and antineutrinos emitted alongside beta-minus and beta-plus particles.
  • Use beta-decay equations and lepton evidence to distinguish neutrino from antineutrino.

CAIE A-Level Physics AS 11.1.9 That Electron Antineutrinos Are Produced During Decay and Electron Questions 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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