Which of the following cannot be emitted by radioactive substances during their decay?
A
Protons
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B
Neutrinos
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C
Helium nuclei
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D
Electrons
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Solution
The correct option is A Protons During nuclear decays like α,β or γ decay, Helium nuclei, electrons and neutrinos are emitted. But no protons or neutrons are emitted in the process of nuclear decay. Hence the correct option is Protons