Which of the following are not emitted by radioactive substances?
(a) Electrons
(b) Protons
(c) Gamma rays
(d) Helium nuclei
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Answer:
(b) Protons
Explanation:
(a) Electrons are emitted in β-decay.
(b) Protons are not emitted in any of the radioactive decay processes
(c) Gamma rays are emitted in γ-decay
(d) Helium nuclei are emitted in α-decay
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