Free neutron changes into proton with the emission of__________________?
Correct answer: C. Both A & B
- A. Neutrino
- B. Electron
- C. Both A & B
- D. Meson
Explanation
In beta-minus decay, a free neutron changes into a proton while emitting an electron and an antineutrino: n → p + e⁻ + antineutrino. At this level, the antineutrino is often loosely called a neutrino, so both A and B are represented by option c. Students may choose only the electron because beta radiation is identified with electrons, but the electron is not the only emitted particle.
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About Discovery of the Proton
The discovery of the proton follows the study of positive rays, also called canal rays, observed in discharge tubes and later identified as positively charged particles. The work of Goldstein and Rutherford is linked to the proton's charge, relative mass and role in the nuclear model, distinct from the discovery of the electron.
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