Physics Crossword Week 3

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Across
  1. 1. moon whose name means fear (6)
  2. 5. the European Organisation for Nuclear Research (4)
  3. 11. can be measured with a light gate (12)
  4. 14. useful power output / total power input (10)
  5. 15. planet with rings (6)
  6. 17. exposure to radiation (11)
  7. 18. type of reflection where a wave is reflected by a rough surface (7)
  8. 20. type of EM wave used for communications (5)
  9. 23. conserved during a change of state (4)
  10. 25. a coil of wire (8)
  11. 26. unit for magnetic flux density (5)
  12. 29. used to generate direct current (7)
  13. 30. explosion of a star (9)
  14. 31. weakest fundamental force (7)
Down
  1. 2. least dense naturally occurring element (8)
  2. 3. inversely proportional to the energy of a Photon (10)
  3. 4. a unit for pressure (7)
  4. 6. the father of antimatter (5)
  5. 7. largest moon in our solar system (8)
  6. 8. an element and a celestial body (7)
  7. 9. potential difference of the earth wire (4)
  8. 10. unit to measure radiation dose (8)
  9. 12. Apollo mission that landed humans on the moon (6)
  10. 13. lens that causes parallel rays of light to diverge (7)
  11. 16. an example of natural satellites (5)
  12. 19. the tendency for motion to remain unchanged (7)
  13. 21. forces such as friction, air resistance, normal contact (7)
  14. 22. also known as a photoresistor (3)
  15. 24. the nature of radioactive decay (6)
  16. 27. successor of the Hubble (4)
  17. 28. interaction by which kaons decay (4)