Physics

• 1. rays were discovered by Wilhelm Conrad Roentgen on

  November 8 1895
• Discovery of X-rays


  Roentgen noticed a fluorescent screen coated with barium platinocyanide emitted a greenish glow when placed near the cathode ray tube, even when it was covered with opaque material
• 1. why is it called x-rays

  Called "x"-rays because of its unknown nature
• Radioactivity was discovered by scientists such as Henri Becquerel, Marie Curie, and Pierre Curie
• Types of radiation emitted by radioactive materials

  • Alpha
  • Beta
  • Gamma
• Radioactivity was discovered by Henri Becquerel


  1896
• Becquerel's discovery


  Accidentally discovered that uranium was emitting a new type of radiation using uranic salts
• Uranic rays/uranium rays


  The radiation emitted by uranium
• Marie Curie and Pierre Curie isolated two new radioactive elements, polonium and radium, from uranium ores


  Unknown
• Radioactivity


  The spontaneous emission of radiation from certain elements
• Radioactive decay


  Unstable atomic nuclei spontaneously transform into more stable nuclei by emitting radiation
• Ernest Rutherford proposed radioactive decay