Question

In ${{\beta }^{+}}$ decay
(A). Antineutrino is produced with electron
(B). Neutrino is produced with positron
(C). Neutrino is produced with electron
(D). None of these

Answer 1

Hint: In a radioactive reaction, the substance emits different particles which results in its decay and ultimately it vanishes by converting into different substances. Particles emitted in a radioactive reaction are alpha, particles, beta particles and gamma particles. The beta decay is of two types depending on the type of particles emitted.

Complete step-by-step solution:
In a radioactive reaction, a substance emits alpha, beta and gamma particles in fixed intervals of time due to which its chemical properties change and it becomes a new substance.
In alpha decay, alpha particles are emitted which are helium like particles which consist of two protons and two neutrons.
In beta decay, beta particles are emitted which are high energy electrons or positrons. Beta decay is of two types-
${{\beta }^{-}}$ decay- in this reaction, electrons are emitted
${{\beta }^{+}}$ decay- in this reaction, positrons are emitted. A positron is an antiparticle or antimatter counterpart of an electron.${{\beta }^{+}}$ decay takes place in a nucleus with one proton. This neutron decays in a nucleus that emits a neutrino and a positron.
Therefore in ${{\beta }^{+}}$ decay, the nucleus emits a neutrino and a positron. Hence, the correct option is (B).

Note: A neutrino is similar to an electron except it does not have a charge and its mass is negligible. A positron has a unit positive charge and its spin is the same as that of an electron. When a positron and an electron collide, they both get destroyed. In a radioactive reaction, the amount decayed per unit time is called the decay constant.