During the ${\rm{\beta }} - {\rm{decay}}$

An electron, already present within the nucleus, is ejected.

A proton in the nucleus decays emitting an electron

NEET UG PHYSICS MCQ: NUCLEI

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During the

\mathrm{\beta } - \mathrm{decay}

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Correct option: D

A neutron in the nucleus decays emitting an electron

Option D is correct because during beta decay, a neutron within the nucleus transforms into a proton, emitting an electron and an antineutrino.

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\mathrm{216}

\mathrm{125}

{ }_{92} X^{236} \rightarrow{ }_{56} Y^{141}+{ }_{36} Z^{92}+3 R

({R})

{R_0}\; = \mathrm{ }1.3fm

\left({ }_0^1 \mathrm{n}\right)

\left({ }_{92}^{235} \mathrm{U}\right)

1\,\,a.m.u = 931\,\,MeV