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Radioactivity was discovered by:
1. Henery Becaquerel
2. Rutherford
3. J.J. Thomson
4. Madame Curie

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Correct Answer - Option 1 : Henery Becaquerel

CONCEPT:

  • Radioactivity: The Phenomenon of spontaneous emission of radiation from radioactive substances is called radioactivity.
    • It is actually a property of atoms and Nuclei. Therefore on the nano-level also it is not affected by chemical or physical changes.
    • Radioactivity, basically, is a nuclear phenomenon in which an unstable nucleus undergoes a decay is called radioactive decay.
    • Three types of Radioactive decay:
  1. α decay in which Helium nucleus He24 is emitted.
  2. β decay in which electron or positron are emitted.
  3. γ decay in which high energy photons are emitted.

EXPLANATION:

  • Henry Becquerel in 1896 discovered radioactivity proving that the uranium emitted radiation without an external source of energy such as the Sun.
  • Marie Curie, who together with her husband Pierre, actually coined the term radioactivity and began investigating the phenomenon recently discovered by Becquerel.
  • Ernest Rutherford did many experiments studying the properties of radioactive decay, named this alpha, beta, and gamma particles, and classified them by their ability to penetrate matter.
  • Enrico Fermi's works were on the artificial radioactivity produced by neutrons, and for nuclear reactions brought about by slow neutrons.

Radioactivity was discovered by Henery Becquerel.

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