Physics definitions

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Across
  1. 8. the joining of two nuclei to form a new, heavier nucleus
  2. 10. the energy transferred in 1 second
  3. 11. the splitting of a heavy nucleus into two smaller pieces along with two or three neutrons
  4. 12. the change in the speed of light as it passes from one material to another
  5. 14. the weight of 1 kg / weight per unit mass
  6. 16. the bending of waves at a gap or obstacle
  7. 17. the distance travelled in 1 second
  8. 18. (of a radioactive source) is the number of decays per second
  9. 19. time for the activity of a radioactive source to decrease by half
  10. 20. high frequency electromagnetic waves (ejected from an unstable nucleus)
  11. 21. the force exerted on 1 square metre
Down
  1. 1. the energy required to increase the temperature of 1 kg of a material by 1 °C
  2. 2. specific latent heat of ____________ of a substance - the energy required to change 1kg of the substance from liquid to gas (at its boiling point)
  3. 3. a measure of the biological effect of a radiation (given the symbol ωR)
  4. 4. a fast moving electron (ejected from an unstable nucleus)
  5. 5. the charge transferred in 1 second
  6. 6. a helium nucleus (ejected from an unstable nucleus)
  7. 7. the change of velocity in 1 second
  8. 9. the energy given to each coulomb of charge by the power supply or battery
  9. 13. when an atom gains or loses electrons
  10. 15. the distance travelled by light in 1 year