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