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  1. Radioactivity is a phenomenon of the spontaneous emission of

    2. A.

     protons (alpha particles)
    B.

     electrons (beta particles)
    C.

     gamma rays (short wave electromagnetic waves)
    D.

     All of the above

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    Answer : Option D

    Explanation :

    Radioactivity is a phenomenon of the spontaneous emission of protons, electrons and gamma rays.

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