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