PHYSICS CROSSWORD

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Across
  1. 5. unit of sound intensity
  2. 8. heat is taken in
  3. 9. splitting of an atom
  4. 11. subatomic particle made of 3 quarks
  5. 12. an isotope of hydrogen
  6. 13. electromotive force
  7. 15. unit of radioactivity
  8. 16. detects small electric currents
  9. 18. instrument to measure height
  10. 19. it has similar atoms
  11. 21. depends on the square of the amplitude
  12. 22. towards the centre
  13. 24. it does not change
  14. 25. attraction between different substances
  15. 29. causes objects to float
  16. 30. kelvin minus 273
  17. 31. name of a number
  18. 33. output to input
  19. 39. moving part of an electric motor
  20. 40. unit of luminosity
  21. 41. science of sound
  22. 42. the ability to do work
  23. 43. ten to the nine
Down
  1. 1. 745.7 watts
  2. 2. for measuring air pressure
  3. 3. spreading out of waves
  4. 4. suspension of particles of liquid in a gas
  5. 6. stores electric charge
  6. 7. rate of change of velocity
  7. 10. two waves together
  8. 14. base units
  9. 17. balanced forces
  10. 20. without an echo
  11. 23. liquid to gas below the boiling point
  12. 26. overtone
  13. 27. use your left hand
  14. 28. flow of charge
  15. 32. breakdown through radioactivity
  16. 34. number of waves per second
  17. 35. ask Newton
  18. 36. a charged atom
  19. 37. force times time
  20. 38. positive terminal of a cell
  21. 40. unit of charge