Atomic Physics Revision

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