Which of the following cannot be emitted by radioactive substances during their decay? (a) Protons (b) Neutrinoes (c) Helium nuclei (d) Electrons

Answer: (a). Natural radioactive decay emits α (helium nuclei), β (electrons or positrons), neutrinos/antineutrinos and γ photons. Protons are not emitted in ordinary radioactive decay. So the answer is (a) Protons.

Which of the following cannot be emitted by radioactive substances… | JEE Main 2003 (AIEEE)

Q36JEE Main 2003 · AIEEEEasy

Radioactive Decays: Alpha, Beta, Gamma

Which of the following cannot be emitted by radioactive substances during their decay?

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Answer: (a)

Natural radioactive decay emits $\alpha$ (helium nuclei), $\beta$ (electrons or positrons), neutrinos/antineutrinos and $\gamma$ photons.
Protons are not emitted in ordinary radioactive decay.
So the answer is (a) Protons.

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