Atomic Physics

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Across
  1. 4. a fast-moving electron
  2. 6. name of the constant which links E with f
  3. 7. radioisotope found in smoke detectors
  4. 12. the length of a wave
  5. 14. the units when you divide the energy in joules by 1.6x10-19
  6. 16. when electrons lose energy and fall to lower shells
  7. 17. the effect of a material emitting electrons when exposed to light
  8. 18. used to test the integrity of pipeline welds
  9. 19. a fundamental particle with a relative mass of 0.0005u
Down
  1. 1. time required for a quantity to reduce to half of its initial value
  2. 2. least penetrating radioactive emission
  3. 3. the fundamental particles that make up protons & neutrons
  4. 5. your physics teacher's first name
  5. 6. particle which has a mass of 1 and a charge of +1
  6. 8. scientist who first showed the nucleus had a concentrated mass and charge
  7. 9. if it has an unstable ratio or protons and neutrons
  8. 10. scientist who first showed the atom was made of smaller things
  9. 11. most used radioisotope in diagnostic imaging
  10. 13. least penetrating radioactive emission
  11. 15. represented by lambda in decay calculations