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(D) Radioactive substances undergo radioactive decay,which involves the emission of radiation from an unstable nucleus.This radiation can be in the fo

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Both $(a)$ and $(c)$

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(D) Radioactive substances undergo radioactive decay,which involves the emission of radiation from an unstable nucleus.This radiation can be in the form of alpha particles (which are charged helium nuclei),beta particles (which are charged electrons or positrons),or gamma rays (which are high-energy electromagnetic radiation).Since alpha and beta particles are charged particles and gamma rays are electromagnetic radiation,both $(a)$ and $(c)$ are correct.Therefore,the correct option is $(d)$.

$A$ radioactive substance emits

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