A radioactive element forms its own isotope after ${\rm{3}}$ consecutive disintegrations. The particles emitted are

${\rm{2}}\,\,{\rm{\beta }}$-particles - ${\rm{1}}\,\,{\rm{\alpha }}$-particle

${\rm{3}}\,\,{\rm{\beta }}$-particles

${\rm{3}}\,\,{\rm{\beta }}$-particles - ${\rm{1}}\,\,{\rm{\gamma }}$-particle

${\rm{2}}\,{\rm{\alpha }}$-particles - ${\rm{1}}\,\,{\rm{\beta }}$-particle

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NEET UG PHYSICS MCQ: NUCLEI

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Analyzing +4 | -1

A radioactive element forms its own isotope after

\mathrm{3}

consecutive disintegrations. The particles emitted are

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Correct option: B

\mathrm{2}\,\,\mathrm{\beta }

-particles -

\mathrm{1}\,\,\mathrm{\alpha }

-particle

Option B (2 β-particles - 1 α-particle) is correct because emission of an alpha particle reduces mass number by 4 and atomic number by 2, while emission of two beta particles increases atomic number by 2, resulting in an isotope of the original element.

NEET UG PHYSICS MCQ: NUCLEI

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