modern physics

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