Answer: Positron.
- A Electron
- B Positron
- C Proton
- D Neutron
Correct answer: B. Positron
Explanation: Beta-plus decay: proton converts to neutron + positron + neutrino. Positron = antiparticle of electron with +e charge.
Binding energy per nucleon rises sharply for light nuclei, peaks around iron-56 (the most stable nucleus), then slowly declines for heavier nuclei - which is exactly why fusing light nuclei or splitting heavy nuclei both release energy: each moves the products toward this stability peak.
Concept context
Radioactivity, nuclear reactions, fission, fusion, and binding energy.