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Question

During a negative beta decay.
  1. An atomic electron is ejected
  2. An electron which is already present within the nucleus is ejected
  3. A neutron in the nucleus decays emitting an electron
  4. A part of the binding energy of the nucleus is converted into an electron

A
A part of the binding energy of the nucleus is converted into an electron
B
An atomic electron is ejected
C
An electron which is already present within the nucleus is ejected
D
A neutron in the nucleus decays emitting an electron
Solution
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Negative β decay is expressed by the equation
np+e+¯¯¯v.
So, a neutron decays into a proton and a negative beta particle (i.e electron) along with a anti-neutrino are emitted.

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