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.

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.

[Maximum number: 1]

Nuclide X with proton number Z undergoes $\beta^{+}$ decay to form nuclide Y .
The decay may be represented by the equation shown.

X \rightarrow Y+\beta^{+}+W

What is the proton number of Y and which particle is represented by the symbol W ?

proton number

of Y

particle

represented by W

$\mathrm{Z}-1$

antineutrino

$\mathrm{Z}-1$

neutrino

$\mathrm{Z}+1$

antineutrino

$\mathrm{Z}+1$

neutrino

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