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(C) Radioactive decay involves the transformation of a neutron into a proton and an electron (or vice versa) within the nucleus.$\beta$-particles are

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Charged particles emitted by the nucleus

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(C) Radioactive decay involves the transformation of a neutron into a proton and an electron (or vice versa) within the nucleus.$\beta$-particles are high-energy electrons or positrons emitted from the nucleus during this process.Since they are electrons or positrons,they carry a net electric charge (negative for $\beta^-$ and positive for $\beta^+$).Therefore,$\beta$-rays are charged particles emitted by the nucleus.

$\beta$-rays emitted by a radioactive material are

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