Q:

What may the term radioactivity correctly used to refer to?

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What may the term radioactivity correctly used to refer to?


  1. The spontaneous emission of electromagnetic radiation from the nucleus of an atom.
  2. The particles or photons emitted from an unstable nucleus.
  3. The emission of particulate radiation from a radionuclide.
  4. The alpha, beta or X-radiation which emanates from some atomic nuclei.

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B: Unstable nucleus = radioactive. Choices A & C also describe radioactivity but not in as general terms as choice B.

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