A) a beta particle
B) an alphaparticle
C) an antineutrino
D) a neutrino
Correct Answer: C
Solution :
Pauli suggested that after emission of \[\beta -\] particle (electron) a neutron is converted into a proton in a nucleus and in this reaction an electron and an anti-neutrino \[(\overrightarrow{v})\] will be formed. This reaction is represented as \[\underset{(Neutron)}{\mathop{_{0}{{n}^{1}}}}\,\to \underset{(\Pr oton)}{\mathop{_{1}{{H}^{1}}}}\,\,\,\,\,\,+\,\,\underset{(Electron)}{\mathop{_{-1}{{\beta }^{0}}}}\,\,\,\,+\,\,\underset{(Anti\,-\,neutrino)}{\mathop{\,\overline{v}}}\,\] Antineutrino is a particle whose mass is negligible and on which no charge is present. \[\Rightarrow \] After emission of P-particle, the total number of particles (mass-number) in a nucleus remains unchanged but no. of neutrons reducing by 1 makes the no. of protons (i.e., charge-number) to increase by 1.
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