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Radioactivity is a phenomenon of the spontaneous emission of

  • A.Alpha particles (helium nuclei)
  • B.Electrons (beta particles)
  • C.Gamma rays (short wave electromagnetic waves)
  • D.All of the above

Answer: D

Radioactivity is the spontaneous emission of all three: alpha particles, beta particles and gamma rays.

An alpha particle is a helium nucleus, a beta particle an electron emitted from the nucleus, and a gamma ray high-energy electromagnetic radiation. Becquerel discovered the phenomenon in uranium in 1896.

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