The Prequantum Era

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Across
  1. 1. Discovered X-rays by accident when he noticed phosphorescent material glowing in his lab.
  2. 4. A type of radiation which has a high ionizing power but low penetrating power.
  3. 6. A type of radiation which has high penetrating power but lower ionizing power.
  4. 8. Device which fires electrons in a vacuum toward a phosphorescent screen to produce images.
  5. 11. Discovered two kinds of radiation which he named after the first letters of the Greek Alphabet.
  6. 12. Discovered a new type of radiation emitted by uranium salts, which he briefly named after himself.
Down
  1. 2. Device invented by Pierre Curie to measure the amount of charge in the air.
  2. 3. The phenomenon Becquerel was investigating when he discovered radiation.
  3. 5. The phenomenon where the spectral lines of an element splits when passed through a magnetic field.
  4. 7. Discovered the electron.
  5. 9. Discovered a third, extremely powerful type of radiation named "gamma rays" by Rutherford.
  6. 10. Discovered and named the phenomenon of radiation as well as two elements, radium and polonium.
  7. 11. Phenomenon discovered by Rutherford and Soddy when they discovered the element radon.