Q169 / 180 · KCET 2020 · Physics

During a $\beta^{-}$-decay

  • A
    an atomic electron is ejected
  • B
    an electron which is already present within the nucleus is ejected
  • Correct answer
    C
    a neutron in the nucleus decays emitting an electron
  • D
    a proton in the nucleus decays emitting an electron

Solution

The process of $\beta^{-}$decay is shown below ${ }_{Z}^{A} X \stackrel{\beta^{-}}{\longrightarrow}{ }_{Z+1}^{A} Y+e^{-}+\bar{v}+\text { energy }$ Thus, in this decay a neutron inside the nucleus decays into a proton with the emission of an electron $e^{-}$and a particle called anti-neutrino $(\bar{v})$.

Hence, the correct answer is option: 'C'.

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