Across
- 1. source of nuclear energy
- 3. the time taken for radioactivity of a specified isotope to lose half value
- 4. carries energy proportional to the radiation frequency but has zero rest mass.
- 7. in this decay a neutron in the atomic nucleus decays into a proton an electron and an antineutrino
- 9. the emission of energy as electromagnetic waves or as moving subatomic particles
- 10. frequency and different speeds is the way these move
Down
- 1. consist of 2 protons and 2 neutrons, emitting radioactive decay or fission.
- 2. A photon is an elementary particle, the quantum of all forms of electromagnetic radiation including light
- 5. the opposite of fission
- 6. the splitting or dividing
- 8. needs lead to stop