IB Physics HL E 3 18 Hl Beta Spectrum and Neutrino Questions

Explain the HL continuous beta spectrum by tracking energy sharing between the beta particle and the emitted neutrino or antineutrino.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • explain why beta-particle energies form a continuous spectrum because decay energy is shared variably with a neutrino or antineutrino
  • identify the beta-decay particle and corresponding neutrino species, then determine the allowed energy range of the beta particle
  • use energy conservation to relate total decay energy, beta-particle energy and neutrino energy

IB Physics HL E 3 18 Hl Beta Spectrum and Neutrino Questions question 1

[Maximum number: 2]

This question is in two parts.

The alpha particles and gamma rays produced in radioactive decay have discrete energy spectra. This suggests that nuclei also possess discrete energy levels. However, beta particles produced in radioactive decay have continuous energy spectra. Describe how the existence of the antineutrino accounts for the continuous nature of beta spectra.

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