modern physics

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