P1 Revision Crossword

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Across
  1. 4. Sound waves are this type of wave
  2. 10. Shortest EM wave
  3. 11. The waves given out by Earthquakes
  4. 15. Energy resource that will not run out
  5. 17. Movement of these causes Earthquakes
  6. 19. Object designed to bend light rays
  7. 20. Longest EM wave
  8. 22. Discovered Infra-Red
  9. 23. Sound below 20Hz
  10. 25. Distance between adjacent peaks on a wave
  11. 26. Another word for movement energy
  12. 28. Evidence for the expanding universe
Down
  1. 1. Used a telescope to see moons around Jupiter
  2. 2. Our Sun is this kind of star
  3. 3. The explosion of a big star
  4. 5. Solar system model with the Earth at the centre
  5. 6. The type of wave where vibrations are perpendicular to wave movement
  6. 7. time The 'break even' point for a method of saving energy
  7. 8. One of the main gases that causes climate change
  8. 9. Solar system model with the sun at the centre
  9. 12. Device used to split light into the spectrum
  10. 13. Used to step up or down voltages
  11. 14. Sound above 20kHz
  12. 16. Useful energy output divided by total energy input
  13. 18. Type of ways used to see bones inside the body
  14. 21. This pulls gas together in a nebula
  15. 24. Discovered Ultra-Violet
  16. 27. Abbreviation for cosmic microwave background radiation