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NEET 2009 (AIPMT) · Radioactive Decays: Alpha, Beta, Gamma

Radioactive Decays: Alpha, Beta, Gamma question from NEET 2009 (AIPMT)

Q30NEET 2009 · AIPMTMedium

Radioactive Decays: Alpha, Beta, Gamma

The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an

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Answer: (c)

Let $n$ $\alpha$ and $2n$ $\beta^-$ be emitted.
$\Delta Z = -2n + 2n = 0$ , while $\Delta A = -4n \ne 0$ .
Same atomic number, different mass number: the daughter is an isotope.
So the answer is (c) isotope of parent.

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